Specifications - State of Delaware

SECTION 260533 - RACEWAYS: continued
15. Provide explosion-proof flexible metal conduit where indicated or required.
16. Provide explosion-proof conduit seals where indicated or required. Fill conduit seals
with sealant as recommended by the manufacturer.
17. Conduit installed above suspended ceilings shall comply with the following:
a. Install exposed conduits and extensions from concealed conduit systems neatly and
parallel with or at right angles to walls of building or structure.
b. Install exposed conduit work so as not to interfere with ceiling inserts, windows,
doors, lights, ventilation ducts or outlets.
c. Support exposed conduits by use of hangers, clamps, or clips. Support conduits on
each side of bends and on spacing not to exceed NEC requirements.
18. For Branch circuits, route conduit above grade. Conduits may be routed in slab with
approval of ANG.
C. Concealed Conduits:
1. Metallic raceways in floors below grade or outside are to have conduit threads painted
with corrosion inhibiting compound before couplings are assembled. Draw up coupling
and conduit sufficiently tight to ensure watertightness.
2. Install underground conduits a minimum of 36 inches below finished grade.
D. Conduits in Concrete Slabs:
1. Place conduits between bottom reinforcing steel and top reinforcing steel.
2. Place conduits either parallel or at 90 degrees to main reinforcing steel.
3. Separate conduits by not less than the outside diameter of the largest conduit to ensure
proper concrete bond.
4. Conduits crossing in slab must be reviewed for proper cover by the Contracting Officer's
Representative.
5. Embedded conduit outside diameter shall not exceed 1/3 of slab thickness. Provide a
minimum of 3/4 inch of concrete cover.
6. Embedded conduit shall be PVC-coated rigid steel conduit.
E. Install conduits so as not to damage or run through solid structural members. Avoid horizontal
or cross runs in building partitions or interior walls. Conduits shall run vertically in all walls to
above ceilings.
F. Exposed Conduits:
1. Install exposed conduits and extensions from concealed conduit systems neatly and
parallel with or at right angles to walls of building or structure.
2. Install exposed conduit work so as not to interfere with ceiling inserts, windows, doors,
lights, ventilation ducts or outlets.
3. Support exposed conduits by use of hangers, clamps, or clips. Support conduits on each
side of bends and on spacing not to exceed NEC requirements.
4. Run conduit for outlets on waterproof walls exposed. Set anchors for supporting conduit
on waterproof wall in waterproof cement.
5. Above requirements for exposed conduits also apply to conduits installed in space above
suspended ceilings and in crawl spaces.
G. Nonmetallic Conduits:
1. Provide only where indicated. Do not install in hazardous locations (unless noted
otherwise).
2. Make solvent cemented joints in accordance with recommendations of manufacturer.
3. Install PVC conduits in accordance with NEC and in compliance with local utility
practices.
DEAN260533.DOC 260533-7