16050-11
BASIC MATERIALS AND METHODS
Installation of Bushings and Grounding Bushings
1. Provide grounding type insulated bushings on all power conduits regardless of
size.
2. Provide grounding type insulated bushings on all control conduit sizes and
signal conduit sizes one and one-quarter inch (I-1/4") trade size and larger.
3. Provide standard bushings for conduits one inch (I") and smaller unless
otherwise stated.
4. Install cable seal bushings in conduits for all outdoor locations and NEMA 4X
locations to prevent moisture from entering enclosures and equipment.
5. Install cable seals in all conduits where there is a change in temperature such as
transitioning from a room to the attic.
6. Provide a bushing at each conduit termination unless fitting at box where
conduit terminates has hubs designed in such a manner to afford equivalent
protection to conductors.
7. Any installations not provided with these requirements shall be removed and
reinstalled at no additional cost to the Owner.
Myers Hubs
1. Myers hubs shall be installed on junction boxes and enclosures which do not
have cast hubs in non classified areas.
Expansion Fittings
1. All conduit installations where conduits extend up out of the ground at
buildings, structures or equipment shall be provided with expansion fittings.
2. Expansion/deflection type fittings shall be provided at all horizontal or vertical
expansion joints, located in new or existing buildings and structures.
Conduit Seals
1. Conduit seals shall be installed in all explosion proof areas Class 1 Division 1,
and Class 1, Division 2 areas. The conduit seal shall be installed per the
National Electric Code Article 501.15 as well as what is shown on the drawings.
2. Upon installation of sealant, the contractor shall mark the conduit seal with
glyptal or permanent marker to indicate that the conduit seal is filled properly.
Link Seals
1. All penetrations through existing and new concrete floors, and walls shall be
core drilled and sleeved, and installed with a link seal.
2. Refer to all details shown on the Contract Drawings for conduit sealing fittings
and weatherproof conduit seals. All conduit penetrations are required to be
provided with seals as noted on the Contract Drawings and as specified. Any
installations not provided with these requirements shall be removed and
reinstalled at no additional cost to the Owner.
Raceways through Wall Bond Outs
1. In specific areas wall bond outs have been designed and shown on the electrical
and structural drawings for conduit installations.
Splicing Methods
1. Feeder conductors shall be continuous from point of origin to load termination
without splice. If this is not practical, contact the Engineer and receive written
approval for splicing prior to installation of feeder(s).
2. For splices and taps, No. 10 AWG and smaller, use solderless "Thread-On"
connectors having spiral steel spring and insulated with a vinyl cap and skirt,
13089K
