Legrand WKD Pro Series System - Manual (Page 8)

8
INSTALLING HOLD DOWN STRAPS:
1. Holds down straps are used to fasten ducts to the slab in shallow
concrete slabs in lieu of adjustable duct supports. When more than
one duct is used, hold down straps maintain 1" [25mm] spacing
between adjacent ducts.
2. Install couplings, Part # 302 for #2 duct, H302 for #4 duct are
required when using hold down straps.
3. Install hold down straps over duct run, making sure tab is in place to
maintain 1" [25mm] spacing between duct runs.
4. After all hold down straps and couplings are in place, line up the duct
runs between the boxes and secure the duct to the slab of form by
driving studs or nails through holes in hold down strap feet. Nails or
studs should be securely fastened to form or slab.
CAUTION:
When using hold down straps,
1/4" [6.35mm] steel shims should be
placed under #2 duct to
maintain proper preset height.
(Wiremold/Legrand Cat. # Duct shim)
STEP 2
STEP 3
INSTALLING MARKER CAPS:
1. Marker caps make it possible to find the start of a run
after concrete has been poured. Marker caps should be
installed on either side of a junction box, at end of duct runs,
on either side of permanent walls and on either side of a change
in direction.
2. Remove the standard blank mudcaps from insert and install
marker caps. Make sure the screw inside the insert marker caps
are turned all the way down before striking insert marker cap.
3. For Pro Series Marker Caps. Markers are plastic and protrude
approximately 3" [76mm] above preset. Trim height to match
screed line.
FINAL ADJUSTMENTS TO THE SYSTEM PRIOR TO THE CONCRETE POUR:
After all boxes, duct runs, and rough-in materials are in place, the following should be checked before concrete is poured. Please
make sure you check off all questions before going to next step:
1. Are all openings in the junction boxes fitted with duct, conduit adapters or box closures.
2. Are the ends of the duct capped.
3. Do all inserts have insert caps.
4. Are all Walkerduct Pro Series inserts aligned within 1/8" [3.2mm], and alignment clips installed at first preset of each
length of duct.
5. Are all presets leveled to the proper elevation. Tops of presets should be no closer than 1/8" [3.2mm] beneath finished
floor. For heavy loads or bar or concrete floors additional concrete is recommended. Consult structural engineer.
6. Bring up all marker screws up to the finished floor level.
7. When the system is checked, leveled and ready for concrete pour, tighten all bonding screws or clips and all locking
screws on junction boxes, duct supports and couplings.
8. Secure all joints against moisture and concrete with waterproof sealing compound or duct tape.
(Example: Wiremold/Legrand Cat. No. 290G).
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