Rev. 13 November 1, 2016
Page | 75ii. Flexible Metal Conduit: Use for final connections to dry type transformer, connections from junction
boxes to lighting fixtures in accessible ceiling, and for wiring within casework and millwork. Fittings
shall be squeeze or screw type galvanized malleable iron or steel with nylon insulated throats. The
maximum length shall be six feet. One trade size larger than standard size if used for communications
infrastructure.
iii. Liquid-tight Flexible Metal Conduit: Use for final connections to all motor operated equipment
such as unit heaters, fans, air handling units, and pumps; and equipment listed in item b located in wet
areas. Fittings shall be galvanized malleable iron or steel, with watertight gaskets, "O" ring and
retainer, and nylon insulated throats. The maximum length shall be six feet.
iv. Galvanized Rigid Steel Conduit (GRS): Use for all feeders larger than 2 inches in size. Fittings shall
be threaded, galvanized malleable iron or heavy steel, water and concrete tight.
v. Intermediate Metal Conduit (IMC): May be used as approved by code where rigid conduit is
specified, except shall not be used for conduit buried in earth fill. Fittings shall be threaded, galvanized
malleable iron or heavy steel, water and concrete tight.
vi. Rigid Aluminum Conduit: Fittings shall be threaded aluminum alloy type.
vii. Rigid PVC Conduit (PVC): Heavy wall Schedule 40 PVC conduit, sunlight resistant and impact
resistant.
c. Installation
i. All horizontal r uns of b ranch circuit conduit shall be installed in ceiling plenum or within walls for
short distances. Conduit for convenience outlets, wall mounted fixtures and other wall outlets shall
be routed ov erhead and dropped through wall to the outlet.
ii. Branch circuit conduit shall not be installed in conc rete floor slabs except where conditions w ill not
permit t he condui t t o be ins talled overhe ad.
iii. Major m ot or or pa nel f eede rs may be installed in c oncrete fl oor slabs.
iv. Expos ed conduit and conduit concealed in ceiling space shall be routed in lines parallel to building
construction.
v. Do not install mor e than three 90 de gree bends between pane lboards, enclos ures, junc tion boxes, or
pull boxes.
vi. All junction or pull boxes shall be identified with the source feed and circuit within.
vii. Support conduit raceway systems in accordance with requirements as set forth in the National
Electric C ode. Condu it shall not be attached to ceiling support wires.
viii. Compression fittings shall be used. Set s crew connectors are prohibited.
d. Applications
i. EMT conduit shall be used for all branch circuit power, lighting, fire alarm, sound, nurse call, and
control conduit.
ii. GRS or IMC conduit shall be used in exterior above grade applications and below paving. PVC
conduit may be used below grade where there is no paving.
iii. Aluminum conduit shall be used in all magnetic imaging facilities where non- ferrous material must
be used. Do not use in other applications.- Electrical Boxes
a. General
i. Pull Boxes: Pull and junction boxes shall be fabricated of heavy gauge galvanized steel
with screw or hinged covers, and equipped with corrosion resistant screws and hardware. Pull
and junction boxes for outdoor installation shall be rain tight.
b. Outlet Boxes: