Legrand 880MPFC User Manual

Wiremold/ Legrand electrical systems conform to and should be
properly grounded in compliance with requirements of the current
National Electrical Code or codes administered by local authorities.

All electrical products may present a possible shock or fire hazard
if improperly installed or used. Wiremold/ Legrand electrical products
may bear the mark as UL Listed and/or Classified and should
be installed in conformance with current local and/or the National
Electrical Code.

880MPFC

Fire Classified Floor Boxes

INSTALLATION INSTRUCTIONS

Installation Instruction No.: 1 007 421 – July 2008

NOTE: 880MPFC is a single gang offering. Can not gang Boxes

together and maintain Fire Classification.

IMPORTANT: Please read all instructions

before beginning.

Step 1 MEASURE AND LOCATE BOX.

Box must be located over deck valley directly above
thickest region of concrete.

Step 2 PREASSEMBLY

Secure box to mounting plate with cable ties or wire.
Loosely insert adapters and conduit elbows into box.

Mounting Plate

Reducer or Plug

Reducer

Offset displaced
downward

Second PVC
Elbow (Optional)

Cut ø 2"
[51mm] Hole
through Deck

Distance to outside
edge of elbow

Step 3 CUT OPENINGS INTO DECK

Measure to the outside edge of the 1" trade size PVC
elbow to the box centerline. Cut a 2" [51mm] tangent
to this dimension. Repeat on opposite side if both PVC
elbows are required.

2"

[51mm]

Step 4 ATTACH MOUNTING PLATE & GLUE

Secure mounting plate to deck by welding or screws.
Glue elbow(s) and adapter(s) in place. Seal any unused
hub with hub plug provided. Offset in mounting plate is
positioned downward. Seal off any excessive gaps
around elbows with duct tape.

1 1/4" to 1" Trade
Size Hub Reducer

Secure to Deck with
Screws or weld

1" Trade Size
PVC Elbow

Seal opening end
with Duct Tape

NOTE: Use only 1" trade size elbow supplied.

Step 5 SECURE CONCRETE

COVER & POUR

Insert body spacer and concrete
cover in box. Do not remove
intumescent pads. Pour concrete
to requires height.

Concrete Cover

Body Spacer

Intumescent Pads –
Do not Remove

Step 6 CUT BOX TO

REQUIRED HEIGHT

After concrete has cured, saw off
the remainder of the box at floor
level using a wood saw. If the final
floor covering is a thick carpet,
leave enough of the box
protruding above the floor
to compensate.

Step 7 CUT CARPET OR FLOOR

COVERING AROUND BOX

After upper section of box is
removed, cut the carpet or floor
covering as indicated.

5 3/8"

[137mm]

4 3/8"

[111mm]

Wiremold / Legrand

U.S. and International:
60 Woodlawn Street • West Hartford, CT 06110
1-800-621-0049 • FAX [phone] • Outside U.S.: 860-233-6251
Canada:
570 Applewood Crescent • Vaughan, Ontario L4K 4B4
1-800-723-5175 • FAX [phone]

1 007 421 0708

© Copyright 2008 Wiremold / Legrand All Rights Reserved

Type 880MPFC outlet boxes for use with 1-, 11/2- or
2-hour rated unprotected reinforced concrete floors, floors
employing unprotected steel floor units and concrete toppings
(D900 Series Designs) or concrete floors with suspended
ceilings. (Fire resistive designs with suspended ceilings should
have provisions for accessibility in the ceiling area below the
outlet boxes.)

The assembled outlet boxes will not reduce the ratings of the
floor assembly when the thickness and type of concrete
(required for specific ratings) are within the specified limits
and the fittings are installed as specified.

1. Concrete – Minimum thickness of structural concrete
topping of 3 1/4" [83mm] on steel deck. Unit weight of
concrete to be 100 to 155 pcf.

2. Installation – Mounted on 2" or 3" [51mm or 76mm] deck.
For use with up to (4) 12 AWG Type THHN power
conductors or (48) 23 AWG tele/data conductors.

Outlet Boxes and Fittings Classified for Fire Resistance Wiremold/ Legrand (R8209)

Step 8 ACTIVATION

CAUTION: Wiring capacity is reduced by 9.0 cu.in. than stated by graduations

on box due to intumescent pads.

COVER PLATES

Adapter Carpet & Duplex Duplex GFCI Round

Tile Flange Dual Rectangular Rectangular Twist

Flip Lid Flip Lid Flip Lid Lock

Brass 817B 828R 828DPGFITC 828GFITC 828DLR

Aluminum 818TCAL 828R-TCAL 828DPGFITCAL 828GFITCAL 828DLRAL

Nonmetallic 880MPA

880MPFC

880MPFC: Complete activation following instructions provided with Adapter

(Cat. No. 880MPA), flange and cover plate. See list below for available options.