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llied Moulded Fire Resiece FAQ Page 1 of 2
•
FREQUENTLY ASKED QUESTIONS .
.Reduction in Horizontal Box Separation in Fire Rated Walls
1. In what type of construction would this rating apply?
This rating applies where non - metallic sheathed cable is used and .walls are constructed of
wood studs and gypsum.
2. If the box is marked with a 2-hour wall rating, is this the,same thing?
• A box that is marked with 2 -hour wall rating means that you can install the box in a 2-hour
fire resistive wall or walls with less than 2 -hour rating. To find out details of the installation,
you must read the instructions found in the UL® Fire Resistive Directory or from the UL
card provided by the manufacturer.
The Directory or UL card describes the following:
1. Those boxes suitable for use in the wall by basic model number
2. The maximum size opening in square inches
3. The maximum openings in total square inches per 100 square feet
4. The maximum clearance around the box
5:. The type construction of the wall assembly — "wood studs and gypsum"
6. The wall designs such as "U -300 Series" meaning all wall designs found in the UL
Fire Resistive Directory from U -301 through U -365, including those staggered stud
designs and separated wall designs.
7. Horizontal separation when mounted on opposite sides of the wall
8. Cover plate material (when limited)
•
3. What is the maximum size box that can go into the same stud cavity?
The maximum size'box that can be mounted in the same stud cavity with another box is a
4 gang box 28 sq. in. Paragraph #1 of the Allied Fire Resistive Card CEYY.R9379 last
three lines state that 4300 (28.0 sq. in.) can be mounted in those walls containing 3'/2"
thick 2.5 PCF mineral wool batt:'insulation or 3'/2" thick min. 0.70 PCF glass fiber batt
insulation. The horizontal separation between outlet and switch boxes on opposite sides of
the wall or partition may be reduced t� three inches. You could mount a 4 gang on one
side and a two gang on the opposite side of the wall. Note: This is not approved for
staggered stud construction.
•
4. Does this rating apply to staggered stud configuration?
Yes. U -300 Series walls have both staggered stud designs in addition to separated type
walls. -
•
5. Will 1 still need to use mineral wool or fiberglass, insulation?
The wall assembly design dictates the , need for`insulation. The wall design does not
change when penetrated by Allied Moulded outlet bones:
6. What if I am actually putting double drywall in the middle to help with sound?
.lf the wall is constructed of wood studs and gypsum board and is a 2 -hour or less fire
http:// www. alliedmoulded .com/outlet_fireFAQ.cfm - 6/14/2007.
_ed Moulded - Fire Resist. FAQ • Page 2 of 2
•
resistive rated, the penetration with an Allied Moulded outlet box will not cause the wall to
be derated'as long as it is installed according to instructions.
7 Can , l put the boxes back to back?
The Fire Resistive card sa.ys.tthe boxes must be separated by three inches horizontal
separation but not back to back.
8. Boxes ;were tested.:with non°- metallic sheathed cable installed. No caulk is wire?
Do you still have to caulk the knockouts that are penetrated. by.t
' is necessary
where knockouts are penetrated by the non metallic sheathed cable.
9. If I accidentally knock out one I'do -not need, do I need to caulk it?
The National Electrical Code requires all unused open knockouts to be closed. Allied
Moulded's speed "K" klamp is an accepted means of closing the knockout (documentation
available upon request). Open unused knockouts in boxes without "K" klamps would need
to be closed.
10. If I accidentally open a knockout I do not need, do I need to caulk it?
The National Electrical Code requires,all unused open knockouts to be closed. Allied
Moulded's speed "K" klamp is an accepted,means of closing the knockout (documentation
available upon request). Open unused knockouts in boxes without "K' klamps would need
to be closed.
11. Is there a rating that relates to vertical separation?
Not to our knowledge.
12. Does this apply to ceiling configurations, as well?
The instructions for ceiling penetrations are found on the same documentation as the wall
boxes, however, the instructions are different.
13. Does this apply to low voltage devices?
The fire resistive rating is for Allied 'Moulded boxes penetrating fire resistive walls classified
at '2 hours or less. What is placed inside the box is covered by the National Electrical Code
and does not affect the fire resistive rating of the box.
•
14. Which inspector °will be enforcing this code? Electrical or. Building or Fire?
Minimum horizontal box separation is a• requirement of the applicable building code.
Generally, the electrical inspector will view the installation first but final compliance falls on
the building inspector.
Please contact our Technical Support Department for clarification on this listing or to
address any further questions.
http:// www. alliedmoulded .com/outlet_fireFAQ.cfm 6/14/2007
•
Underwriters
Laboratories Ih CEYY.R9379
Outlet Boxes and Fittings Classified for Fire Resistance
Last Updated on 2006 -09 -25
ALLIED MOULDED PRODUCTS INC
222 N UNION ST
BRYAN, OH 43506 USA
R9379
Series 1082, 1084, 1085, 1086, 1088, 1096, 1098, 1099, 2300, 2301, 2302, 3300, 3303, 4300, 4304, 9301, 9302, 9304,
9305, 9307, 9312, 9313, 9318, 9323, 9324, 9327, 9328, 9329 -E, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338, 9339,
9340, 9342, 9343, 9344, 9350, 9351, 9355, 9356, 9358, 9361, 9363, 9364, 9365, 9366, 9368, 9369, 9370, 9372, 9373,
93:74, 9390, 9395, RD -38 nonmetallic outlet and switch boxes with various suffixes. For use in fire resistance walls
constructed of wood or nonbearing,steel studs and gypsum board with Classification periods of 2 hrs or Tess. Clearance
between boxes and cutouts in wall shall not exceed 1/8 in. The area of openings for boxes shall not aggregate more than
100 sq in. per 100 sq ft of wall or partition area with no opening exceeding 28.0 sq in. Outlet and switch boxes on
opposite sides of a wall or partition shall be separated by a horizontal distance of not less than 24 in In walls. containing
3 -1/2 in. thick, min 2.5 pcf mineral wool batt insulation or 3 -1/2 in. thick, min 0.70 pcfglass fiber batt insulation, the
horizontal separation between outlet and switch boxes on opposite sides of the wall or partition may be reduced to 3 in.
Series 1082, 1084, 1085, 1086, 1088, 1096, 1098, 1099, 2300, 2301, 2302, 3300, 3303, 9301, 9302, 9304, 9305, 9307,
9312, 9313,9318, 9323, 9324, 9327, 9328, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338, 9339, 9340, 9342, 9343,
9344, 9350, 9351, 9355, 9356, 9358, 9361, 9363, 9364, 9365, 9366, 9368, 9369, 9370, 9372, 9373, 9374, 9390, 9395,
RD -38 nonmetallic outlet and switch boxes with various suffixes for use in 1 and 2 hr fire rated gypsum board /wood stud
wall assemblies framed with min 3 -1 /2 in. wide wood studs and constructed as 'specified in the individual U300 Series
Wall and Partition Designs in the Fire Resistance Directory . Clearance between boxes and cut -outs in wall shall not
exceed 1/8 in. The area of openings for boxes shall not aggregate more than 100 sq in. per 100 sq ft of wall or partition
area with no opening exceeding 22.0 sq in. Outlet and switch boxes on opposite sides of a wall or partition shall be
separated by a horizontal distance of not less than 3 in. Boxes are suitable for installation in staggered stud wall
configuration.
Series 1.082, 1084, 1085, 1086, 1088, 1096, 1098, 1099, 2300, 2301, 2302, 3300, 3303, 9301, 9302,-9304, 9305, 9307,
9312, 9313, 9318, 9323, 9324, 9327, 9328, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338, 9339, 9340, 9342, 9343,
9344, 9350, 9351, 9355, 9356, 9358, 9361, 9363, 9364, 9365, 9366, 9368, 9369, 9370, 9372, 9373, 9374, 9390, 9395,
RD -38 nonmetallic , outlet and switch boxes• with various suffixes for use in Design No U351 incorporating staggered
studs and mineral wool cavity infill. Clearance between boxes and cut =outs in wall shall not exceed 1/8 in The area of
openings for boxes shall not aggregate more than 100 sq in per 100 sq ft of wall or partition area with no opening
exceeding, 22.0.,sq in Outlet and switch boxes on opposite sides of a wall or partition shall be separated by a horizontal
distance of not less than 3 in.
Series PC213, PC234, 1082, 1084, 1085, 1086, 1088, 1096, 1098, 1099, 9301, 9304, 9305, 9307, 9318, 9323, 9324,
9327, 9328, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338; 9350, 9351, 9355, 9356, 9358, 9363, 9364; 9365, 9366,
9368, 9369, 9370, 9373, 9374, 9390, 9395 nonmetallic outlet boxes with, various suffixes, intended for fixture supports.
For use in fire resistance floor- ceiling assemblies consisting of wood floor, solid or pre- engineered wood joists or trusses
and gypsum board ceiling with Classification periods of 2 hrs or less. Clearance between boxes and cutouts in ceiling
shall not exceed 1/8 in The area of openings for boxes shall not °aggregate more than 64.7 sq in per 100 sq ft of ceiling
area with no opening exceeding 12.5 sq in No box shall be located within 4.5 ft of another box within a common joist
cavity. When the supports are solid wood joists or pre- engineered wood joists with solid web members, the distance
between boxes in adjacent cavities may be reduced to 5 -1/2 in. center -to- center.
•
Types P181, P201, P241, P332, P442, P463, P643, P- 1220W, PJ20 and PJ32, nonmetallic outlet and switch boxes. For
use in fire resistance walls constructed of wood or nonbearing steel studs and gypsum board with Classification periods
CEYY.R9379 page 1 of 3
•
of 2 hrs or less. Clearance between boxes and cutouts in wall shall not exceed 1/8 in. The area of openings for boxes
shall not aggregate; -more than 100 sq in per 100 sq ft of wall or partition area with no opening exceeding 22.1 sq in
Outlet boxes on opposite sides of wall or partition shall be separated by a horizontal distance of not less than 24 in.
Types PI81, P201, P241, P- 1220W, PJ20 and PJ32, nonmetallic outlet boxes not intended for fixture support. For use in
fire resistance floor - ceiling assemblies consisting of wood floor, solid or pre- engineered wood joists or trusses and
gypsum board ceiling with Classification periods of 2h or less. Clearance between boxes and cutouts in ceiling shall not
exceed 1/8 in. The.area of openings for boxes shall not aggregate more than 26.5 sq in. per 100 sq ft of ceiling area, with
no opening exceeding 12.5 sq in. No box shall be shall be located within 4.5 ft of another box. The boxes shall be
installed in compliance with the National Electrical Code.
Types 9500 nonmetallic outlet and switch boxes. For use in fire resistance walls constructed of wood or nonbearing steel
studs and gypsum board with Classification periods of 2 hrs or less. Max. wall opening not to exceed two 3/4 in. in diam
holes per box. The boxes shall not aggregate more than 100 sq in. per 100 sq ° ft of wall or partition area with no box
exceeding 12.6 sq in. Outlet boxes on opposite sides of wall or partition shall be separated by a horizontal distance of not
less than 24 in. Type 9500 nonmetallic outlet and switch boxes to be installed per the accompanying installation
instruction sheet.
Types 9500 nonmetallic outlet boxes intended for fixture support. For use in fire resistance floor- ceiling assemblies
consisting of wood floor, sold or pre- engineered wood joists or trusses and gypsum board ceiling with Classification
periods of 2 hrs or less. Max ceiling opening not to exceed two 3/4 in diam holes per box. The boxes shall not aggregate
more than 26.5 sq in. per 100 . sq ft of ceiling area, with no opening exceeding 12.6 sq in. No box shall be located within
4.5 ft. of another box. Type 9500 nonmetallic outlet and switch boxes to be installed per the accompanying installation
instruction sheet and in compliance with the National Electrical Code.
Series 1082, 1084, 1085, 1086, 1088, 1096, 1098, 1099, 2300, 2301, 2302, 3300, 3303, 9301, 9302, 9304, 9305, 9307,
9312, 9313, 9318, 9323, 9324, 9327, 9328, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338, 9339, 9340, 9342, 9343,
9344, 9350, 9351, 9355, 9356, 9358, 9361, 9363, 9364, 9365, 9366, 9368, 9369, 9370, 9372, 9373, 9374, 9390, 9395,
RD -38 nonmetallic outlet and switch boxes with various suffixes for use with moldable putty pads manufactured by
Specified Technologies Inc. and designated Spec Seal Putty Pads. Spec Seal putty pads are Classified in the Fire
Resistance Directory under the category Wall Opening Protective Materials. Putty pads and boxes for use in 1 and 2 hr
fire rated gypsum .board /wood stud wall assemblies framed with min 3 -1/2 in wide wood studs and constructed as
specified in the individual U300 Series Wall and Partition Designs in the Fire Resistance Directory . Outlet box secured
to wood stud by means of two nailing tabs in conjunction with nails supplied with the outlet box. Min 3/16 in. thick
moldable putty pads are to be installed to completely cover the exterior surfaces of the outlet box (except for the side of
the outlet box against the stud) including nailing tabs and completely seal against the stud within the stud cavity. An
additional 3/16 in thickness of putty to be formed around the end of each nonmetallic sheathed cable at its connection to
the box. Boxes installed with steel or plastic cover plates. When moldable putty pad outlet box protective material is
used on boxes on both sides of wall as directed, the horizontal separation between outlet on opposite sides of the
wall may be less than 24 in. provided that the boxes are not installed back -to -back.
Series 1082, 1084, 1085, 1086, 1088, 1096, 1098, 1099, 2300, 2301, 2302, 9301, 9302, 9304, 9305, 9307, 9312, 9318,
9323, 9324, 9327, 9328, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338, 9339, 9340, 9342, 9343, 9344, 9350, 9351,
9355, 9356, 9358, 9361, 9363, 9364, 9365, 9366, 9368, 9369, 9370; 9372, 9373, 9374, 9390, 9395, RD -38 nonmetallic
outletand switch boxes with various suffixes for use with moldable putty pads manufactured by Minnesota Mining &
Mfg Co. and designated. MPP -4S+ Putty Pads. ,MPP -4S+ putty pads are Classified in the Fire Resistance Directory under
the category Wall Opening Protective Materials. Putty pads and boxes for use in 1 and •2 hr fire rated gypsum
board /wood stud wall assemblies framed with min 3 -5/8 in wide wood studs and constructed as specified in the
individual U300 Series Wall and Partition Designs in the Fire Resistance Directory . Moldable putty pads are to be
installed to completely cover the exterior surfaces of the outlet box (except for the side of the outlet box against the stud)
including nailing tabs and completely seal against the stud within the stud cavity An additional 3/16 in thickness of
putty to be formed around the end of each nonmetallic sheathed cable at its connection to the box. Boxes installed with
steel or plastic cover plates. When moldable putty pad outlet box protective material is used on boxes on both sides of
wall as directed, the horizontal separation between outlet boxes on opposite sides of the wall may be less than 24 in.
. provided that the boxes are not installed back -to -back.
Series 1082, 1084, 1085, 1.086, 1088, 1096, 1098, 1099, 2300, 2301, 2302, 9301, 9302, 9304, 9305, 9307, 9312, 9318,
9323, 9324, 9327, 9328, 9331, 9332, 9333, 9334, 9335, 9336, 9337, 9338, 9339, 9340, 9342, 9343, 9344, 9350, 9351,
9355, 9356, 9358, 9361, 9363, 9364, 9365, 9366, 9368, 9369, 9370, 9372, 9373, 9374, 9390, 9395, RD -38 nonmetallic
outlet and switch boxes with various suffixes for use with moldable putty ;pads manufactured by Nelson Firestop
Products and designated FSP firestop Putty Pads. FSP firestop putty pads are Classified in the Fire Resistance Directory
CEYY.R9379 page 2 of 3