Project Number: 228730
Issue Date: August 2017
WWTE SCADA Upgrades
Nashua, NH
TABLE 2.03A — Electrical Enclosure Types
Location/Equipment Acceptable Enclosure Type
Exterior (unclassified) NEMA 4X
NEMA 7 (Explosion Proof)
Class 1 Division 1, Division 2 Locations NEMA 4X for Intrinsically Safe
Equipment
PART 3 —- EXECUTION
3.01 CONDUIT
A. Uses Permitted
1.
Use liquid tight flexible metal conduit for the final 24 inches of
connections to motors or control items subject to movement or vibration.
Use RGS for all exterior aboveground installations unless otherwise noted.
Use PVC coated rigid steel conduit, or as scheduled below, for installation
in corrosive areas, and other areas as identified on the Contract Drawings.
Use Schedule 80 PVC conduit for all underground installations. The
transition from underground and from sand-encasement to riser shall be
PVC coated rigid steel conduit to a minimum of 12” above finished grade
elevation. All elbows shall be prefabricated Rigid Steel to prevent wire
burn through. Reference specification 26 05 43 “Underground Ducts and
Raceways for Electrical Systems” for further requirements.
Install conduit seals for conduit penetrations of slabs on grade and exterior
walls below grade and where indicated. Tighten sleeve seal screws until
sealing grommets have expanded to form watertight seal. Provide seals
for the interior of conduits that penetrate exterior or water bearing walls,
consisting of gland type sealing bushings or RTV closed cell silicone
foam. Refer to Table 3.01A below for approved conduit types:
TABLE 3.01A — Conduit Types
Location/Equipment Approved Conduit Type
Exterior Rigid Galvanized Steel
B. Power,
and all
lighting, control, emergency light and power, and special-service systems
related components shall be installed in accordance with NFPA 70, and
RACEWAYS, BOXES AND SUPPORTING DEVICES
WOODARD & CURRAN 26 05 34-8
