Correspondence ) Y
February 23, 2005 bop
CITY OF TIGARD
OREGON
Electrical Permit No.: ELC 2005 -00079
Address: 7117 SW Beveland St.
Project name: Zimmler Developmaent
Plans Dated: February 11, 2005
The plan review was performed under the Oregon Electrical Specialty Code (OESC) 2002
edition which includes the 2002 edition of the National Electrical Code (NEC).
The submitted plans are approved subject to the following conditions:
1. This project is using series rated circuit breaker combinations to comply with NEC 110.9
(interrupting rating sufficient for the available fault current). These plans are approved
based on the representation that the exact equipment and breaker combinations that will
be installed are specifically certified as series rated combinations. The electrical
•
contractor will be required to demonstrate to the field inspector that each piece of
equipment that is relying on series rating is listed by its manufacturer as having been
tested in the specific combination installed and is certified for the fault current available.
(A check list is included to assist in this. More copies may be downloaded at
www.bussmann.com).
2. Series combination rated equipment shall be marked per NEC 110.22.
3. All equipment to comply with NEC 110.9 (...sufficient to interrupt available current...)
4. The grounding electrode system must include all electrodes available on the premises
(NEC 250.50 and 250.52)
5. All HVAC equipment requiring servicing shall have a 120 volt receptacle within 25 feet
(NEC 210.63) and when located on a roof it shall have GFCI protection (NEC 210.8).
6. All HVAC equipment shall have a disconnect within sight. (NEC424.19 and 440.14)
7. Americans with Disabilities Act (ADA): It shall be the responsibility of the Architect,
Engineer, Designer, Contractor, Owner and Lessee to research the applicability of the
ADA requirements for the structure. The City of Tigard reviews the plans and inspects
the structure only for compliance with the OESC which may not include all of the
requirements of the ADA.
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
hoitio,ifx
CITY OF TIGARD
OREGON
8. Approved Plans: One set of approved plans, bearing the City of Tigard approval
stamp, shall be maintained on the jobsite. The plans shall be available to the
Building Division inspectors throughout all phases of construction.
Sincerely,
/C
Kim Appleberry
Electrical Inspector
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
INSPECTION FORM: Series Rated Combination
ISSUED BY:
This form provides documentation to assure compliance with the following National Electrical Code ®, NFPA 70, sections
on the use of Series Rated Combinations: 110.9, 110.22 & 240.86
JOB #
NAME:
LOCATION:
CONTRACTOR:
ESSENTIAL INFORMATION:
Lineside
Fuse or CB Line Side Panel Designation (If applicable)
(Protectuta) Line Side Overcurrent Protective Device Part Number
Available
' `— scc Line Side Overcurrent Protective Device Interrupting Rating
X Available Short Circuit Current at Line side OCP Device
Available
SCC Load Side Panel Designation
:^ Load Side Circuit Breaker Part Number
DDD Load Side Circuit Breaker Individual Interrupting Rating
Load Side CB Series Combination Interrupting Rating
(Protected)
X2 Available Short Circuit Current at Load side Circuit Breaker
Compliance Checklist
(For further information see discussion on reverse side for each item)
1. Short- Circuit Currents
Is the interrupting rating of the line side fuse or circuit breaker greater than the J YES J NO
available short- circuit current (X1) at its lineside (110.9)
Is the series combination interrupting rating greater than the available short - circuit J YES J NO
current (X2) at the load side circuit breaker (permitted per 240.86)?
2. Manufacturer's Label
Are both devices in use for the series rated combination marked on the end use
equipment in which the load side circuit breaker is installed (or contained in a Li YES J NO
booklet affixed to the equipment) as required in 240.86(A)?
3. Field Installed Label
Are field labels, as required by 110.22, that indicate "CAUTION — Series Rated DYES J NO
Combination ", along with the required replacement parts, panel designations, and
series combination interrupting rating, installed on all end use equipment that
contain the series combination rating devices?
4. Motor Contribution
If motors are connected between the series rated devices, is the combined full load Li YES J NO
current from these motors less than 1% of the downstream circuit breakers'
interrupting rating (individual or stand alone interrupting rating) per 240.86(B)?
5. Selective Coordination
Is this series rated combination being installed in something other than a health care J YES J NO
facility (see NEC® 517.17)?
Elevator circuits only: Is this series rated combination being installed on an elevator O YES J NO
circuit with only one elevator in the building (see NEC® 620.62)?
AN ANSWER OF "NO" TO ANY OF THESE QUESTIONS MAY INDICATE A LACK OF COMPLIANCE.
LACK OF SUBMITTAL IS CONSIDERED AS EVIDENCE OF LACK OF COMPLIANCE.
•1
Series Rated Combination
What is a Series Rated Combination?
A combination of two devices, that have been tested under specific test conditions that work together to clear a fault. The allowed combina-
tions are limited to those that have been selected by the circuit breaker manufacturer for testing. Only tested combinations can be used.
CAUTION: A series rated combination allows a load side circuit breaker to be applied where the available short circuit current
exceeds the interrupting rating marked on that circuit breaker.
BACKGROUND TO CHECKLIST ITEM
110.22 & 240.86(A) Labeling
1) Short- Circuit Currents Contractor Installed Label
The series combination interrupting rating must be greater i
than the available short- circuit current at the load side cir- CAUTION
cult breaker (240.86) and the interrupting rating of the line Panel Series Rated Combination
side fuse or circuit breaker must be greater than the MDP1 with panelLDP1
available short- circuit current at its line terminals (110.9). Rated W0000 Amperes
Replace with Only _
200 Amp Class J Fuses
2) Manufacturer's Label
Since the use of series rated combinations are limited to — ,
specific combinations that have been tested, the end use
equipment is required to be marked, by the manufacturer,
per 240.86(A) of the 2002 NEC ®. Since there are hun- Panel Mfr's Label
dreds of combinations, this marking may be in a book that NRTL Listing of Series
is affixed to the end use equipment, as allowed in UL67. Combination Rating of
The manufacturer's marking is used to verify that both / 200.000 amperes when CB Co.
devices are part of a recognized series rated combination, Contractor Installed Label r XYZ Circuit Breaker
{ the panelboard is listed for use with the combination, and Q Protected byMaximum
that the series combination interrupting rating is sufficient CAUTION � s i 400 A Class J Fuse
for the available short circuit current. This label also Series Rated Combination
provides guidance for future upgrades as to the specific with 200 Amp Class J fuses in MDP1
Rated 100,000 Amperes
replacement devices that are allowed. Replace widt only CB Co. i } ; Panel LDP1
3) Field Installed Label XYZ Circuit Breaker
110.22 of the 2002 NEC requires the installer to apply a
field caution label warning that a series rated combination is being used. This label must be applied on the panel containing the series
rated combination or on both pieces of electrical equipment if the line side device is located separate from the load side circuit breaker to
assure that the proper devices have been installed and that proper future replacements are made. The inspector can check the devices
noted on the field label required by 110.22 against the tested and listed series rated combinations marked on the panelboard or switch-
board by the manufacturer per 240.86.
4) Motor Contribution
S eries Rated Combi A series rated combination is evaluated under specific testing condi
tions of which motor contribution is not a part of the criteria. If a
This does not motor(s) were connected in the middle of the combination, it would
Series Rated I comply with NEC' supply extra fault current that did not exist when the combination was
om
Cbination 24(1.86(B) tested. 240.86(B) of the 2002 NEC' addresses this by prohibiting the
Combination
.a. LR use of series rated combinations when the sum of the full load current
22,4404
Motor Contribution of the motors exceeds 1% of the interrupting rating marked on the
LOAD SIDE circuit For example, the load side circuit breaker
is rated 10,0, 000 A.I R... . with with motor loads exceeding 100 amps, then a
series rated combination could not be used. For other than lighting
CB Standalone ) panels, it is necessary to investigate the protected circuit breaker of a
Interruptin_ Ratin_ I series combination to insure that the protected circuit breaker's
lit, ttui _�. individual interrupting rating complies with 240.86(B). For other than
O 0 lighting panels, it is advisable not to utilize series rated combinations
for building spaces where the loads may change during the life of the
tutor P.L.. - \. > 11111:\ (l "/° LR.) electrical system. If more motor loads are added, the series combina-
tion rating for that application could be negated.
5) Selective Coordination
A disadvantage of a series rated combination is that, by definition. for fault conditions the line side (protecting) device must open at the
same time, and in conjunction with, the load side (protected) circuit breaker. This means that the entire panel loses power because the
device feeding the panel must open under medium to high level short- circuit conditions. For life and safety reasons, the NEC® requires
selective coordination in some applications Main to feeder series rated combinations do not meet the requirements of 517 17 in health
care facilities. Series rated combinations do not meet 620.62 for elevator circuits that contain more than one elevator. Series rated
combinations would reduce the overall system reliability of emergency circuits as presented in 700.25 FPN because of their inherent lack
of fault current coordination