16050-8
BASIC MATERIALS AND METHODS
12) Heavywall aluminum conduit. Galvanized heavy duty rigid steel conduit as
approved by the Engineer.
Wiring 600 volts or less in dry concealed locations [hung above ceilings, attic
areas, or within CMU block walls] (NEMA 1 or 12): Galvanized electrical
metallic tubing (for raceway sizes up to and including 2" trade size) or
galvanized rigid heavy wall steel conduit.
Wiring 600 volts or less in dry exposed indoor locations (NEMA 1 or 12): Rigid
heavy wall aluminum conduit. Galvanized rigid heavy wall steel conduit as
approved by the Engineer.
Wiring 600 volts or less in indoor wet locations or outdoor above grade
locations (NEMA 3R or 4X): Rigid heavy wall aluminum conduit. Galvanized
rigid heavy wall steel conduit as approved by the Engineer.
Wiring 600 volts or less in indoor or outdoor corrosive chemical areas (NEMA
4X Corrosive) (SAL 12/15/14): use PVC-coated rigid steel conduit in these
areas less than 8 feet from finished floor. Use PVC Schedule 80 conduit in these
areas 8 feet or more from finished floor in corrosive chemical areas. Where
conduits transition, a NEMA 4X stainless steel or PVC coated junction box or
pull box must be installed. The metal conduit shall be provided with a
grounding bushing and the metal conduit and metal box shall be bonded to the
ground conductor within the raceway per NEC.
Wiring 600 volts or less in hazardous locations (NEMA 7 or 9): Galvanized
rigid heavy wall steel conduit, PVC galvanized rigid steel conduit, or rigid
heavy wall aluminum conduit.
a. PVC coated rigid galvanized steel (RGS) conduit: manufacturer shall
provide field installers certification training. All installers shall be field
certified from manufacturer and provide proof of certification for
installation upon request.
b. All field installation and repairs of PVC coated rigid galvanized steel (RGS)
conduit shall conform to manufacturer’s recommendation and use of
manufacturer patch and repair kits in order to guarantee certified products
are used and compliance with all factory warranty guidelines are met.
Use of Miscellaneous Conduit Types
a. Flexible "liquid tight" metal conduit shall be used for final connection to
the following:
* all motors * rotating or vibrating equipment
* dry type transformers * recessed lighting fixtures
Lengths of liquid tight flexible metal conduit shall be kept to a minimum
(12 to 18 inches) and maximum length of 2'-6" except when dictated
otherwise by a particular installation approved by the Engineer and as
allowed by NEC.
b. PVC Schedule 80 non metallic conduit shall be used as shown on drawings.
c. Conductors for fire alarm circuits shall be routed in rigid galvanized steel
conduit unless otherwise noted on the drawings. Minimum conduit size
shall be 4".
d. Armored direct burial cable shall be installed underground to equipment as
shown on drawings.
e. Metal Clad cable (MC) shall be installed in the following locations:
13089K
