Legrand FD - Manual

GENERAL:
1. Review and become familiar with all flushduct components. Be careful of sharp edges or burrs when handling any sheet metal
parts. All interior surfaces that can be touched by a wire shall be smooth.
2. Compare and coordinate the architectural and electrical drawings with the Wiremold / Legrand installation drawings. Contact
your local Wiremold field sales representative immediately if any dimensions or details are incorrect.
3. On arrival, check the shipment for shortages or damage. Contact your local Wiremold field sales representative immediately if
there are any problems. File a freight claim for any damage directly with the carrier. Keep material and cartons dry.
4. Install duct and related components in accordance with Article 354 of the latest issue of the National Electrical Code.
5. Wiremold / Legrand recommends a vapor barrier be provided when duct is installed directly on grade. This barrier
prevents ground moisture from reaching the underside of the concrete slab through capillary action. This barrier would be
placed below any infloor distribution system.
Flushduct ® Duct &
Junction Boxes
I N S T A L L A T I O N I N S T R U C T I O N S
Installation Instruction No.: IBO169R1 – Updated May 2006
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.
IMPORTANT: Please read all instructions
before beginning.
DUCT:
1. Flushduct is manufactured in three sizes:
a. Single – 3 1/8" [79mm] wide and 1 1/4" [32mm] deep.
b. Double – 2 single ducts welded side by side 6 1/4" [159mm] wide and 1 1/4" [32mm] deep.
c. Triple – 3 single ducts welded side by side 9 3/8" [238mm] wide and 1 1/4" [32mm] deep.
2. The largest conductor to be installed in either duct shall be 1/0.
Approx. Area Allowable Number of
Sq. In. Wires/Cables*
#2 Duct
Tele/Data Cables
2 pr. phone, Area = .0154 86
4 pr. phone, Area = .0380 35
Type 1 shielded twisted pr., Area = .1194 11
Coaxial, Area = .0460 29
25 pr. phone, Area = .1320 10
Power Conductors
#12 THHN, Area = .0133 100
#10 THHN, Area = .0211 63
# 8 THHN, Area = .0366 36
1/0 Cable, Area = .1855 7
WIRE FILL CAPACITY CHART
* Capacities based on 40% wire fill allowed by the National Electrical Code. At the 40% fill,
duct will be crowded and wire pulling may be difficult. When transiting through junction
boxes, around turns, and through inserts, wires will take up more space. A 20% wire fill at
these locations will allow easier fishing and pulling of cables.
3. Factory punched openings are threaded 1 5/8-18. For installation of screw plugs only. Only 455F Series can be installed in
this opening, or also in 1 5/8 straight through holes cut in the field..