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<4, ARTICLE 516— SPRAY APPLICATION, DIPPING, AND COATING PROCESSES 516.3
(B) Insulation. Conductor insulation shall comply with signs, and maintenance, see NFPA 33 - 2007, Standard for
501.20. Spray Application Using Flammable and Combustible Ma-
terials, and NFPA 34 - 2007, Standard for Dipping and
(C) Nonmetallic Wiring. Where rigid nonmetallic conduit Coating Processes Using Flammable or Combustible Liq-
or cable with a nonmetallic sheath is used, an equipment uids. For additional information regarding ventilation, see
NFPA 91 2004, Standard for Exhaust Systems for Air Con
grounding conductor shall be included to provide for elec-
trical continuity of the raceway system and for grounding ►eying of Vapors, Gases, Mists, and Noncombustible Par
ticulate Solids.
of non - current - carrying metal parts.
516.2 Definitions. For the purpose of this article, the fol-
515.9 Sealing. Sealing requirements shall apply to hori-
lowing definitions shall apply.
zontal as well as to vertical boundaries of the defined Class
I locations. Buried raceways and cables under defined Class Spray Area. Normally, locations outside of buildings or local -
I locations shall be considered to be within a Class I, Divi- ized operations within a larger room or space. Such are nor-
sion 1 or Zone 1 location. malty provided with some local vapor extraction/ventilation
system. In automated operations, the area limits shall be the
515.10 Special Equipment — Gasoline Dispensers. maximum area in the direct path of spray operations. In
Where gasoline or other volatile flammable liquids or liq- manual operations, the area limits shall be the maximum area
uefied flammable gases are dispensed at bulk stations, the of spray when aimed at 180 degrees to the application surface.
applicable provisions of Article 514 shall apply.
Spray Booth. An enclosure or insert within a larger room
515.16 Grounding ; = ai 1 @ 3r All metal raceways, the used for spray /coating /dipping applications. A spray booth
metal armor or metallic sheath on cables, and all non- may be fully enclosed or have open front or face and may
current-carrying metal parts of fixed or portable electrical include separate conveyor entrance and exit. The spray
equipment, regardless of voltage, shall be grounded N booth is provided with a dedicated ventilation exhaust but
as provided in Article 250. may draw supply air from the larger room or have a dedi-
Grounding : in Class I locations shall com- cated air supply.
ply with 501.30 for Class I, Division 1 and 2 locations and
505.25 for Class I, Zone 0, 1, and 2 locations. Spray Room. A purposefully enclosed room built for
spray /coating /dipping applications provided with dedicated
FPN: For information on grounding for static protection, ventilation supply and exhaust. Normally the room is con -
see 4.5.3.4 and 4.5.3.5 of NFPA 30 -2008, Flammable and
Combustible Liquids Code. figured to house the item to be painted, providing reason-
able access around the item/process. Depending on the size
of the item being painted, such rooms may actually be the
entire building or the major portion thereof.
-., ,'Y+j•' k"",' x re ,y "vara .,, r L sr-w
ARTIC l ,1 S 1(► 516.3 Classification of Locations. Classification is based
Spra) Application, Dipping, on dangerous quantities of flammable vapors, combustible
and Coating Processes mists, residues, dusts, or deposits.
(A) Class I, Division 1 or Class I, Zone 0 Locations. The
FPN: Rules that are followed by a reference in brackets following spaces shall be considered Class I, Division 1, or
contain text that has been extracted from NFPA 33 -2007, Class I, Zone 0, as applicable:
Standard for Spray Application Using Flammable and
Combustible Materials, or NFPA 34 - 2007, Standard for (1) The interior of any open or closed container of a flam-
Dipping and Coating Processes Using Flammable or Corn mable liquid
bustible Liquids. Only editorial changes were made to the (2) The interior of any dip tank or coating tank
extracted text to make it consistent with this Code.
FPN: For additional guidance and explanatory diagrams,
516.1 Scope. This article covers the regular or frequent see 4.3.5 of NFPA 33 -2007, Standard for Spray Application
application of flammable liquids, combustible liquids, and Using Flammable or Combustible Materials, and Sections
combustible powders by spray operations and the applica- 4.2, 4.3, and 4.4 of NFPA 34 -2007, Standard for Dipping
lion of flammable liquids, or combustible liquids at tern- and Coating Processes Using Flammable or Combustible
peratures above their flashpoint, by dipping, coating, or Liquids.
other means. (B) Class I or Class II, Division 1 Locations. The follow -
FPN: For further information regarding safeguards for ing spaces shall be considered Class I, Division 1, or Class
these processes, such as fire protection, posting of warning I, Zone 1, or Class II, Division 1 locations, as applicable:
2008 Edition NATIONAL ELECTRICAL CODE 70 -419
•r
516.3 ARTICLE 516 — SPRAY APPLICATION, DIPPING, AND COATING PROCESSES 1.
(1) The interior of spray booths and rooms except as spe-
cifically provided in 516.3(D).
(2) The interior of exhaust ducts. Spray ��
(3) Any area in the direct path of spray operations.
6100 mm
(4) For open dipping and coating operations, all space . (20 ft)
within a 1.5 -m (5 -ft) radial distance from the vapor
sources extending from these surfaces to the floor. The
vapor source shall be the liquid exposed in the process
and the drainboard, and any dipped or coated object
from which it is possible to measure vapor concentra- Top (plan)
tions exceeding 25 percent of the lower flammable
limit at a distance of 300 mm (1 ft), in any direction,
from the object. Roof
(5) Sumps, pits, or belowgrade channels within 7.5 m
(25 ft) horizontally of a vapor source. If the sump, pit, 3050 m
or channel extends beyond 7.5 m (25 ft) from the vapor (10 0) Spray area
source, it shall be provided with a vapor stop or it shall
be classified as Class I, Division 1 for its entire length. ``\
(6) All space in all directions outside of but within 900 mm
(3 ft) of open containers, supply containers, spray gun
cleaners, and solvent distillation units containing flam-
Front (elevation)
mable liquids. Class I, Division 1; Class I, Zone 1;
(C) Class I or Class II, Division 2 Locations. The follow or Class II, Division 1
in spaces shall be considered Class I, Division 2, or Class ∎ Class I, Division 2; Class I, Zone 2;
g P " ` or Class II, Division 2
I, Zone 2, or Class H, Division 2 as applicable.
Figure 516.3(C)(1) Electrical Area Classification for Open
(1) Open Spraying. For open spraying, all space outside Spray Areas. (33:Figure 6.5.1]
of but within 6 m (20 ft) horizontally and 3 m (10 ft)
vertically of the Class I, Division 1 or Class I, Zone 1 For the purposes of this subsection, interlocked shall
location as defined in 516.3(A), and not separated from it mean that the spray application equipment cannot be oper-
by partitions. See Figure 516.3(C)(1). [33:6.5.1] ated unless the exhaust ventilation system is operating and
(2) Closed - Top, Open - Face, and Open - Front Spraying. functioning properly and spray application is automatically
If spray application operations are conducted within a stopped if the exhaust ventilation system fails. [33:6.5.2.2]
closed -top, open -face, or open -front booth or room, any (3) Open - Top Spraying. For spraying operations con -
electrical wiring or utilization equipment located outside of ducted within an open top spray booth, the space 900 mm
the booth or room but within the boundaries designated as (3 ft) vertically above the booth and within 900 mm (3 ft)
Division 2 or Zone 2 in Figure 516.3(C)(2) shall be suitable of other booth openings shall be considered Class I, Divi-
for Class I, Division 2, Class I, Zone 2, or Class H, Divi- sion 2; Class I, Zone 2; or Class II, Division 2. [33:6.5.3]
sion 2 locations, whichever is applicable. The Class I, Di-
vision 2, Class I, Zone 2, or Class II, Division 2 locations (4) Enclosed Booths and Rooms. For spraying operations
shown in Figure 516.3(C)(2) shall extend from the edges of confined to an enclosed spray booth or room, the space
the open face or open front of the booth or room in accor- within 900 mm (3 ft) in all directions from any openings
dance with the following: shall be considered Class I, Division 2; or Class I, Zone 2;
(a) If the exhaust ventilation system is interlocked with or Class II, Division 2 as shown in Figure 516.3(C)(4).
the spray application equipment, the Division 2 or Zone 2 [33:6.5.4]
location shall extend 1.5 m (5 ft) horizontally and 900 mm (5) Dip Tanks and Drain Boards — Surrounding Space.
(3 ft) vertically from the open face or open front of the For dip tanks and drain boards, the 914-mm (3 -ft) space
booth or room, as shown in Figure 516.3(C)(2), top. surrounding the Class I, Division 1 or Class I, Zone 1
(b) If the exhaust ventilation system is not interlocked location as defined in 516.3(A)(4) and as shown in Figure
with the spray application equipment, the Division 2 or 516.3(C)(5). [34.6.4.4]
Zone 2 location shall extend 3 m (10 ft) horizontally and
900 mm (3 ft) vertically from the open face or open front of (6) Dip Tanks and Drain Boards — Space Above Floor.
the booth or room, as shown in Figure 516.3(C)(2), bottom. For dip tanks and drain boards, the space 900 mm (3 ft)
70-420 NATIONAL ELECTRICAL CODE 2008 Edition
1• .
4• ARTICLE 516 —SPRAY APPLICATION, DIPPING, AND COATING PROCESSES 516.3
1525 mm (5 ft) radius 915 mm (3 ft) radius 4. Extent of Class I or
915 mm (3 ft) radius 915 mm (3 ft) radius
900 mm R Class II, Division 2 area
L i ` • 900 mm R ft)
(3 ft) £— ' ' 4 Ofi 1 : :
915 mm '
`` (3 ft) radius 1 '� lip s,
Enclosed spray
915 mm (3 ft) radius I „� - -_ booth or room
915 mm (3 ft) radius ._- Conve or I (Class I, Division 1 or
y Class II, Division 1 within)
opening !
'
Open
face 1525 mm ��
900 mm R
(5 ft) radius (3 ft)
Plan view 900 mm R
3050 m (10 ft) radius (3 ft)
915 mm (3 ft) radius
915 mm ) radius 915 mm (3 ft) radius ft 3 900 mm R (3 ft) 900 mm R (3 ft)
(
x' \ a 900 mm R
v ,
1 1 (3 ft)
a
„,...., ,..__. , ,
(3 mm
(3 ft) radius A ,
Conveyor Ele
915 mm (3 ft) radius
915 mm (3 ft) radius opening
' Figure 516.3(C)(4) Class I, Division 2, Class I, Zone 2, or
Class II, Division 2 Locations Adjacent to an Enclosed Spray
Booth or Spray Room. [33:Figure 6.5.4]
Open 3050 m
, face (10 ft) radius
Figure 516.3(C)(2) Class I, Division 2, Class I, Zone 2, or
Class II, Division 2 Locations Adjacent to a Closed Top, Open
Face, or Open Front Spray Booth or Room. [33:Figures
6.5.2(a) and 6.5.2(b)]
1525 mm Point beyond which object
1525 mm (5 ft) is no longer a vapor source
915 mm (5 ft) ```` 6. as defined in 516.3(B)(4)
Conve or rail (3 ft) ```` f' r
915 mm A
a ft r )s a 9 E �$ ' a
a
6 7f w .x '1:;:•,::4: v X` N S �' Nh `
1525 mm < a - - h # ,�
' n z �3 t. x z,, �" . s .., . fi ,333:"T;' K zS � � , r. a i �
915 mm (5 ft) . r: 915 mm
s : 11 A .41 = y�; ' z " 4,4e,,b t,'; (3 ft
(3 ft) t: �,.; ai: , � .. ��������
mo �X ( ft)
• , 9 15 mm �— 915 mm 3 ft)
Floor
Pit �. . ( ft) Dra k (
1525 mm 1525 mm
6100 mm (20 ft) ► 1525 mm (5 ft) (5 ft) c 6100 mm (20 ft) r
(5 ft)
® Class I, Division 1 or Zone 0
Class I, Division 1 or Zone 1
® Class I, Division 2 or Zone 2
Figure 516.3(C)(5) Electrical Area Classification for Open Processes Without Vapor
Containment or Ventilation. [34:Figure 6.4(a)]
2008 Edition NATIONAL ELECTRICAL CODE 70-421
I
516.4 ARTICLE 516 — SPRAY APPLICATION, DIPPING, AND COATING PROCESSES
above the floor and extending 6 m (20 ft) horizontally in all (B) Wiring and Equipment — Vapors and Residues.
directions from the Class I, Division 1 or Class I, Zone 1 Unless specifically listed for locations containing deposits
location. of dangerous quantities of flammable or combustible va-
Exception: This space shall not be required to be consid pors, mists, residues, dusts, or deposits (as applicable),
ered a hazardous (classified) location where the vapor there shall be no electrical equipment in any spray area as
herein defined whereon deposits of combustible residue
source area is 0.46 m 2 (5 ft or less and where the contents
of the open tank trough or container do not exceed 19 L may readily accumulate, except wiring in rigid metal con -
(5 gal). In addition, the vapor concentration during opera duit, intermediate metal conduit, Type MI cable, or in metal
tion and shutdown periods shall not exceed 25 percent of boxes or fittings containing no taps, splices, or terminal
the lower flammable limit outside the Class I location connections. [33:6.4.2]
specified in 516.3(B)(4). [34 :6.4.4 Exception]
(C) Illumination. Illumination of readily ignitible areas
(7) Open Containers. All space in all directions within through panels of glass or other transparent or translucent
600 mm (2 ft) of the Division 1 or Zone 1 area surrounding material shall be permitted only if it complies with the
open containers, supply containers, spray gun cleaners, and following:
solvent distillation units containing flammable liquids, as (1) Fixed lighting units are used as the source of illumina-
well as the area extending 1.5 m (5 ft) beyond the Division tion.
1 or Zone 1 area up to a height of 460 mm (18 in.) above (2) The panel effectively isolates the Class I location from
the floor or grade level. [33:6.6.2] the area in which the lighting unit is located.
(D) Enclosed Coating and Dipping Operations. The (3) The lighting unit is identified for its specific location.
space adjacent to an enclosed dipping or coating process or (4) The panel is of a material or is protected so that break -
apparatus shall be considered unclassified. [34:6.5.3] age is unlikely.
(5) The arrangement is such that normal accumulations of
Exception: The space within 900 mm (3 ft) in all directions hazardous residue on the surface of the panel will not
from any opening in the enclosures shall be classified as be raised to a dangerous temperature by radiation or
Class I, Division 2 or Class I, Zone 2, as applicable. conduction from the source of illumination.
[34 :6.5.2]
(D) Portable Equipment. Portable electric or
(E) Adjacent Locations. Adjacent locations that are cut other utilization equipment shall not be used in a spray area
off from the defined Class I or Class II locations by tight during spray operations.
partitions without communicating openings, and within
which flammable vapors or combustible powders are not Exception No. 1: Where portable electric gam are
likely to be released, shall be unclassified. required for operations in spaces not readily illuminated by
fixed lighting within the spraying area, they shall be of the
(F) Unclassified Locations. Locations using drying, cur - type identified for Class !, Division 1 or Class 1, Zone 1
ing, or fusion apparatus and provided with positive me locations where readily ignitible residues may be present.
chanical ventilation adequate to prevent accumulation of [33 :6.9 Exception]
flammable concentrations of vapors, and provided with ef-
fective interlocks to de- energize all electrical equipment Exception No. 2: Where portable electric drying apparatus
(other than equipment identified for Class I locations) in is used in automobile refinishing spray booths and the fol
case the ventilating equipment is inoperative, shall be per- lowing requirements are met:
mitted to be unclassified where the authority having juris- (a) The apparatus and its electrical connections are not
diction so judges. located within the spray enclosure during spray operations.
(b) Electrical equipment within 450 mm (18 in.) of the
FPN: For further information regarding safeguards, see floor is identified for Class !, Division 2 or Class I, Zone 2
NFPA 86 -2007, Standard for Ovens and Furnaces.
locations.
516.4 Wiring and Equipment in Class I Locations. (c) All metallic parts of the drying apparatus are elec-
trically bonded and grounded.
(A) Wiring and Equipment — Vapors. All electrical wir (d) Interlocks are provided to prevent the operation of
ing and equipment within the Class I location (containing spray equipment while drying apparatus is within the spray
vapor only — not residues) defined in 516.3 shall comply enclosure, to allow for a 3 - minute purge of the enclosure
with the applicable provisions of Article 501 or Article 505, before energizing the drying apparatus and to shut off dry-
as applicable. ing apparatus on failure of ventilation system.
70-422 NATIONAL ELECTRICAL CODE 2008 Edition
ARTICLE 516 — SPRAY APPLICATION, DIPPING, AND COATING PROCESSES 516.10
4.
(E) Electrostatic Equipment. Electrostatic spraying or (2) Electrostatic Equipment. Electrodes and electrostatic
detearing equipment shall be installed and used only as atomizing heads shall be adequately supported in perma-
provided in 516.10. nent locations and shall be effectively insulated from
ground. Electrodes and electrostatic atomizing heads that are
FPN: For further information, see NFPA 33 - 2007, Stan -
darri for Spray Application Using Flammable or Combus permanently attached to their bases, supports, reciprocators, or
tible Materials. robots shall be deemed to comply with this section.
516.7 Wiring and Equipment Not Within Class I and II (3) High- Voltage Leads. High - voltage leads shall be prop-
erly insulated and protected from mechanical damage or
Locations. exposure to destructive chemicals. Any exposed element at
(A) Wiring. All fixed wiring above the Class I and II lo- high voltage shall be effectively and permanently supported
cations shall be in metal raceways, rigid nonmetallic con- on suitable insulators and shall be effectively guarded
duit, or electrical nonmetallic tubing, or shall be Type MI, against accidental contact or grounding.
TC, or MC cable. Cellular metal floor raceways shall be (4) Support of Goods. Goods being coated using this pro -
permitted only for supplying ceiling outlets or extensions to cess shall be supported on conveyors or hangers. The con -
the area below the floor of a Class I or II location, but such veyors or hangers shall be arranged (1) to ensure that the
raceways shall have no connections leading into or through parts being coated are electrically connected to ground with
the Class I or II location above the floor unless suitable a resistance of 1 megohm or less and (2) to prevent parts
seals are provided. from swinging.
(B) Equipment. Equipment that may produce arcs, sparks, (5) Automatic Controls. Electrostatic apparatus shall be
or particles of hot metal, such as lamps and lampholders for equipped with automatic means that will rapidly de-
fixed lighting, cutouts, switches, receptacles, motors, or energize the high - voltage elements under any of the follow -
other equipment having make- and -break or sliding con- ing conditions:
tacts, where installed above a Class I or H location or above (1) Stoppage of ventilating fans or failure of ventilating
a location where freshly finished goods are handled, shall equipment from any cause
be of the totally enclosed type or be constructed so as to (2) Stoppage of the conveyor carrying goods through the
prevent the escape of sparks or hot metal particles. high - voltage field unless stoppage is required by the
516.10 Special Equipment. spray process
(3) Occurrence of excessive current leakage at any point in
(A) Fixed Electrostatic Equipment. This section shall ap- the high - voltage system
ply to any equipment using electrostatically charged ele- (4) De- energizing the primary voltage input to the power
ments for the atomization, charging, and/or precipitation of supply
hazardous materials for coatings on articles or for other
similar purposes in which the charging or atomizing device (6) Grounding. All electrically conductive objects in the
is attached to a mechanical support or manipulator. This spray area, except those objects required by the process to
shall include robotic devices. This section shall not apply to be at high voltage, shall be adequately grounded. This re-
devices that are held or manipulated by hand. Where robot quirement shall apply to paint containers, wash cans,
or programming procedures involve manual manipulation guards, hose connectors, brackets, and any other electri-
of the robot arm while spraying with the high voltage on, cally conductive objects or devices in the area.
the provisions of 516.10(B) shall apply. The installation of
. electrostatic spraying equipment shall comply with ,., ,k ! ,.. ) 2
��
516.10(A)(1) through (A)(10). Spray equipment shall be
listed. All automatic electrostatic equipment systems shall � 4
comply with 516.4(A)(1) through (A)(9).
(1) Power and Control Equipment. Transformers, high-
voltage supplies, control apparatus, and all other electrical (7) Isolation. Safeguards such as adequate booths, fencing,
portions of the equipment shall be installed outside of the railings, interlocks, or other means shall be placed about
Class I location as defined in 516.3 or be of a type identi- the equipment or incorporated therein so that they, either by
fled for the location. their location, character, or both, ensure that a safe separa-
Exception: High - voltage grids, electrodes, electrostatic at
tion of the process is maintained.
omizing heads, and their connections shall be permitted (8) Signs. Signs shall be conspicuously posted to convey
within the Class I location. the following:
2008 Edition NATIONAL ELECTRICAL CODE 70.423
516.10 ARTICLE 516 — SPRAY APPLICATION, DIPPING, AND COATING PROCESSES
(1) Designate the process zone as dangerous with regard to other persons entering the spray area shall be conspicuously
fire and accident posted.
(2) Identify the grounding requirements for all electrically (4) Electrostatic Equipment. All electrically conductive
conductive objects in the spray area objects in the spraying area shall be adequately grounded.
(3) Restrict access to qualified personnel only This requirement shall apply to paint containers, wash cans,
(9) Insulators. All insulators shall be kept clean and dry. and any other electrical conductive objects or devices in the
area. The equipment shall carry a prominent, permanently
(10) Other Than Nonincendive Equipment. Spray equip- installed warning regarding the necessity for this grounding
ment that cannot be classified as nonincendive shall comply feature.
with (A)(10)(a) and (A)(l
(a) Conveyors or hangers shall be arranged so as to °, r „ 7. -
maintain a safe distance of at least twice the sparking dis- , xs rt
tance between goods being painted and electrodes, electro-
static atomizing heads, or charged conductors. Warnings
defining this safe distance shall be posted. [33:11.4.1] r 3:
(b) The equipment shall provide an automatic means (5) Support of Objects. Objects being painted shall be
of rapidly de- energizing the high - voltage elements in the maintained in metallic contact with the conveyor or other
event the distance between the goods being painted and the grounded support. Hooks shall be regularly cleaned to en-
electrodes or electrostatic atomizing heads falls below that sure adequate grounding of 1 megohm or less. Areas of
specified in (a). [33:11.3.8] contact shall be sharp points or knife edges where possible.
Points of support of the object shall be concealed from
(B) Electrostatic Hand Spraying Equipment. This sec- random spray where feasible; and, where the objects being
Lion shall apply to any equipment using electrostatically sprayed are supported from a conveyor, the point of attach -
charged elements for the atomization, charging, and/or pre- ment to the conveyor shall be located so as to not collect
cipitation of materials for coatings on articles, or for other spray material during normal operation. [33: Chapter 12]
similar purposes in which the atomizing device is hand-
held or manipulated during the spraying operation. Electro- (C) Powder Coating. This section shall apply to processes
static hand - spraying equipment and devices used in con- in which combustible dry powders are applied. The hazards
nection with paint - spraying operations shall be of listed associated with combustible dusts are present in such a
types and shall comply with 516.10(B)(1) through (B)(5). process to a degree, depending on the chemical composi-
tion of the material, particle size, shape, and distribution.
(1) General. The high - voltage circuits shall be designed so
as not to produce a spark of sufficient intensity to ignite the ( Electrical Equipment and Sources of Ignition. Elec-
most readily ignitible of those vapor —air mixtures likely to trical equipment and other sources of ignition shall comply
MI
be encountered, or result in appreciable shock hazard upon with the requirements of Article 502. Portable electric
nal
coming in contact with a grounded object under all normal and other utilization equipment shall not be used
operating conditions. The electrostatically charged exposed within a Class H location during operation of the finishing
elements of the handgun shall be capable of being ener-
processes. Where such ,: ' or utilization equipment
gized only by an actuator that also controls the coating are used during cleaning or repairing operations, they shall
material supply. be of a type identified for Class II, Division 1 locations and
all exposed metal parts shall be
(2) Power Equipment. Transformers, power packs, con-
trol apparatus, and all other electrical portions of the equip Exception: Where portable electric ,, are required
ment shall be located outside of the Class I location or be for operations in spaces not readily illuminated by fixed
identified for the location. lighting within the spraying area, they shall be of the type
Exception: The handgun itself and its connections to the listed for Class II, Division 1 locations where readily ig-
power supply shall be permitted within the Class I location. nitible residues may be present.
(3) Handle. The handle of the spraying gun shall be elec- (2) Fixed Electrostatic Spraying Equipment. The provi-
trically connected to ground by a metallic connection and sions of 516.10(A) and 516.10(C)(1) shall apply to fixed
be constructed so that the operator in normal operating electrostatic spraying .equipment.
position is in intimate electrical contact with the grounded (3) Electrostatic Hand - Spraying Equipment. The provi-
handle to prevent buildup of a static charge on the opera- sions of 516.10(B) and 516.10(C)(1) shall apply to electro-
tor's body. Signs indicating the necessity for grounding static hand - spraying equipment.
70 NATIONAL ELECTRICAL CODE 2008 Edition
Z. ARTICLE 517 — HEALTH CARE FACILITIES 517.2
(4) Electrostatic Fluidized Beds. Electrostatic fluidized I. General
beds and associated equipment shall be of identified types.
The high- voltage circuits shall be designed such that any dis- 517.1 Scope. The provisions of this article shall apply to
charge produced when the charging electrodes of the bed are electrical construction and installation criteria in health care
approached or contacted by a grounded object shall not be of facilities that provide services to human beings.
sufficient intensity to ignite any powder air mixture likely to The requirements in Parts II and III not only apply to
be encountered or to result in an appreciable shock hazard. single - function buildings but are also intended to be indi-
(a) Transformers, power packs, control apparatus, and vidually applied to their respective forms of occupancy
all other electrical portions of the equipment shall be lo- within a multifunction building (e.g., a doctor's examining
cated outside the powder - coating area or shall otherwise room located within a limited care facility would be re-
comply with the requirements of 516.10(C)(1).
quired to meet the provisions of 517.10).
Exception: The charging electrodes and their connections FPN: For information concerning performance, mainte-
to the power supply shall be permitted within the powder nance, and testing criteria, refer to the appropriate health
coating area. care facilities documents.
(b) All electrically conductive objects within the 517.2 Definitions.
powder- coating area shall be adequately grounded. The
powder- coating equipment shall carry a prominent, perma- Alternate Power Source. One or more generator sets, or
nently installed warning regarding the necessity for ground- battery systems where permitted, intended to provide power
ing these objects. during the interruption of the normal electrical services or
the public utility electrical service intended to provide
power during interruption of service normally provided by
the generating facilities on the premises.
Ambulatory Health Care " N t r. A building or IN
thereof used to provide services or treatment " • , }.
to four or more patients
(c) Objects being coated shall be maintained in electri-
cal contact (less than 1 megohm) with the conveyor or (1) Treatment for patients that yw inca
other support in order to ensure proper grounding. Hangers
shall be regularly cleaned to ensure effective electrical con- gable of taking action for self - preservation under emer-
tact. Areas of electrical contact shall be sharp points or gency conditions without assistance others.
knife edges where possible.
(d) The electrical equipment and compressed air sup-
plies shall be interlocked with a ventilation system so that
the equipment cannot be operated unless the ventilating (
fans are in operation. (33:Chapter 151 aleallaillinalanlEMMEMN
516.16 Grounding. All metal raceways, the metal armors
or metallic sheath on cables, and all non - current - carrying
metal parts of fixed or portable electrical equipment, re- Anesthetizing Location. Any area of a facility that has
r gardless of voltage, shall be grounded Ground- been designated to be used for the administration of any
ing - shall comply with 501.30, 502.30, or
flammable or nonflammable inhalation anesthetic agent in
505.25, as applicable. the course of examination or treatment, including the use of
such agents for relative analgesia.
Critical Branch. A subsystem of the emergency system
consisting of feeders and branch circuits supplying energy
1R TI(1 ), - 17 to task illumination, special power circuits, and selected
receptacles serving areas and functions related to patient
liay¢11(lI (',;ire Facilities care and ig are connected to alternate power sources by
one or more transfer switches during interruption of normal
FPN: Rules that are followed by a reference in brackets power source. EMI
contain text that has been extracted from NFPA 99 -2005, El Life-Support Equipment. Electrically powered
Standard for Health Care Facilities, and NFPA 101 -2006, ppo y P
Life Safety Code. Only editorial changes were made to the equipment whose continuous operation is necessary to
extracted text to make it consistent with this Code. maintain a patient's life.
•
2008 Edition NATIONAL ELECTRICAL CODE 70-425
517.2 ARTICLE 517 —HEALTH CARE FACILITIES
Emergency System. A system of circuits and equipment Hospital. A building or °' _ thereof used
intended to supply alternate power to a limited number of for the medical, psychiatric, obstetrical, or surgical
prescribed functions vital to the protection of l i f e and care of f o u r or m o r e inpatients. ‘ . , A
safety. : Isolated Power System. A system comprising an isolating
Equipment System. A system of circuits and equipment transformer or its equivalent, a line isolation monitor, and
arranged for delayed, automatic, or manual connection to its ungrounded circuit conductors.
the alternate power source and that serves primarily Isolation Transformer. A transformer of the multiple -
3- phase power equipment. winding type, with the primary and secondary windings
Essential Electrical System. A system comprised of alter- physically separated, which inductively couples its second -
nate sources of power and all connected distribution sys- aty winding to the grounded feeder systems that energize
tems and ancillary equipment, designed to ensure continu- its primary winding.
ity of electrical power to designated areas and functions of Life Safety Branch. A subsystem of the emergency system
a health care facility during disruption of normal power consisting of feeders and branch circuits, meeting the re-
sources, and also to minimize disruption within the internal quirements of Article 700 and intended to provide adequate
wiring system. power needs to ensure safety to patients and personnel, and
Exposed Conductive Surfaces. Those surfaces that are ca- that are automatically connected to alternate power sources
pable of carrying electric current and that are unprotected, during interruption of the normal power source. °x
unenclosed, or unguarded, permitting personal contact. Limited Care Facility. A building or `? 0' thereof used
Paint, anodizing, and similar coatings are not considered on a 24 -hour basis for the housing of four or more persons
suitable insulation, unless they are listed for such use. who are incapable of self - preservation because of age;
Fault Hazard Current. See Hazard Current. physical limitation due to accident or illness; or limitations
such as mental retardation /developmental disability, mental
Flammable Anesthetics. Gases or vapors, such as flurox- illness, or chemical dependency. gown
ene, cyclopropane, divinyl ether, ethyl chloride, ethyl ether, Line Isolation Monitor. A test instrument designed to con -
and ethylene, which may form flammable or explosive mix- tinually check the balanced and unbalanced impedance
tures with air, oxygen, or reducing gases such as nitrous from each line of-an isolated circuit to ground and equipped
oxide. with a built -in test circuit to exercise the alarm without
Flammable Anesthetizing Location. Any area of the fa- adding to the leakage current hazard.
cility that has been designated to be used for the adminis- Monitor Hazard Current. See Hazard Current.
tration of any flammable inhalation anesthetic agents in the
normal course of examination or treatment. Nurses' Stations. Areas intended to provide a center of
nursing activity for a group of nurses serving bed patients,
Hazard Current. For a given set of connections in an where the patient calls are received, nurses are dispatched,
isolated power system, the total current that would flow nurses' notes written, inpatient charts prepared, and medi-
through a low impedance if it were connected between cations prepared for distribution to patients. Where such
either isolated conductor and ground. activities are carried on in more than one location within a
Fault Hazard Current. The hazard current of a given iso- nursing unit, all such separate areas are considered a part of
lated system with all devices connected except the line the nurses' station.
isolation monitor. Nursing Home. A building or IMMEIMINI used on
Monitor Hazard Current. The hazard current of the line a 24 -hour basis MaINSEIRMIERN of four or
isolation monitor alone. more persons who, because of mental or physical incapac-
Total Hazard Current. The hazard current of a given iso-
ity ' '' ®' unable to provide for their own needs and
lated system with all devices, including the line isolation safety without the assistance of another person.
monitor, connected.
Health Care Facilities. Buildings or portions of buildings Patient Bed Location. The location of a patient sleeping
bed
in which medical, dental, psychiatric, nursing, obstetrical,
or the bed or procedure table a critical care area.
or surgical care are provided. Health care facilities include,
but are not limited to, hospitals, nursing homes, limited Patient Care Area. Any portion of a health care facility
care facilities, clinics, medical and dental offices, and am- wherein patients are intended to be examined or treated. Areas
bulatory care centers, whether permanent or movable. of a health care facility in which patient care is administered
70 NATIONAL ELECTRICAL CODE 2008 Edition