Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
shall be enclosed in separate conduit or separate conduit systems as indicated on
the Contract Drawings and as specified herein.
C. Any run of conduit between outlet and outlet, between fitting and fitting, or
between outlet and fitting shall contain not more than the equivalent of three 90-
degree bends, including those bends located immediately at the outlet or fitting.
Field bends shall be made in accordance with the manufacturer's
recommendations, which normally require use of a one-size-larger bender than
would be required for uncoated conduit. Installed conduit and fittings shall be
free of dirt and trash and shall not be deformed or crushed. Empty conduit shall
have a pull rope stalled.
D. Conduit shall be installed with a minimum of 3 inches of free air space separation
from mechanical piping..
E. Install exposed conduits, parallel or perpendicular to walls, ceilings, or structural
members. Do not run through structural members. Avoid horizontal runs within
partitions or sidewalls. Avoid ceiling inserts, lights, or ventilation ducts or outlets.
Do not run conduits across pipe shafts or ventilation duct openings and keep
conduits a minimum of 6 inches from parallel runs of flues, hot water pipes, or
other sources of heat. Wherever possible, install horizontal raceway runs above
water and steam piping.
F. Do not run conduits exposed on the exterior surface of buildings. Conduits
penetrating exterior walls below grade, at grade floors, or below grade floors shall
be sealed to prevent moisture migration. The exterior of the conduit shall be
sealed with a mechanical pipe seal. The interior conduit seal shall be a gland type
sealing bushing or RTV closed cell silicone foam. Ensure that conduits do not
retain water against these seals.
G. Raceways penetrating fire rated walls, floors, and partitions shall be sealed with a
fire rated sealant.
H. All conduits shall be supported with materials specifically made for this purpose.
Do not use wire hangers. Do not attach any parts of the raceway system to
ventilation ducts. Conduit supports shall be attached to the building. Support
conduits on each side of bends and on a spacing not to exceed the following: 6
feet for conduits smaller than 1 1/4 inches and 8 feet for conduits 1 1/4 inches and
larger. Support riser conduits at each floor level with clamp hangers. All
underground conduits shall be securely anchored to prevent movement during
placement of concrete or backfill. Use precast separators and heavy gauge wire
ties or other approved fasteners.
I. Provide E.Y'S. seal fittings with appropriate potting material where conduits enter
or leave a Class 1, Division 1 or 2 environments or a Class 2, Division 1 or 2
environment, and chemical rooms.
RACEWAYS, BOXES AND SUPPORTING DEVICES
WOODARD & CURRAN 26 05 34-9
