SECTION 16052
HAZARDOUS CLASSIFIED AREA CONSTRUCTION
PART 1
1.01
1.02
SUMMARY
A.
Section includes:
1. Executing and completing Work in hazardous and/or classified areas as
defined by the National Electrical Code (NEC) Articles 500 through 516,
NFPA 820, and as indicated on the Drawings and specified in the
Specifications.
B.
Related sections:
1. The Contract Documents are complementary; what is called for by one is as
binding as if called for by all.
2. It is the CONTRACTOR’s responsibility for scheduling and coordinating the
Work of subcontractors, suppliers, and other individuals or entities performing
or furnishing any of CONTRACTOR’s Work.
3. The following sections are related to the Work described in this Section. This
list of related sections is provided for convenience only and is not intended to
excuse or otherwise diminish the duty of the CONTRACTOR to see that the
completed Work complies accurately with the Contract Documents.
a. Section 16050 - Common Work Results for Electrical.
b. Section 16130 - Conduits.
c. Section 16134 - Boxes.
d. Section 16140 - Wiring Devices.
e. Section 16150 - Low Voltage Wire Connections.
REFERENCES
A.
1.03
GENERAL
As specified in Section 16050.
DEFINITIONS
A.
As specified in Section 16050.
B.
Specific definitions:
1. For the purposes of these Specifications, the terms “Hazardous” and
“Classified” will be considered synonymous.
1.04
(NOT USED)
1.05
(NOT USED)
1.06
QUALITY ASSURANCE
A.
As specified in Section 16050.
B.
Regulatory requirements:
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1.
2.
3.
1.07
DELIVERY, STORAGE, AND HANDLING
A.
1.08
All wiring in hazardous and/or classified locations shall comply with all
applicable articles of the NEC, in particular Articles 500 through 516.
Except as modified in Articles 500 through 516, all other applicable rules
contained in the NEC shall apply to electric equipment and wiring installed in
hazardous and/or classified locations.
All devices used in Class I Division 1 or Division 2 areas must have visible
manufacturer installed nameplates specifically stating the Class, Division, and
Group for which the device is approved.
As specified in Section 16050.
PROJECT OR SITE CONDITIONS
A.
A list of hazardous areas is specified in Section 16050.
1.09
(NOT USED)
1.10
(NOT USED)
1.11
(NOT USED)
1.12
(NOT USED)
1.13
(NOT USED)
1.14
(NOT USED)
1.15
(NOT USED)
PART 2
PRODUCTS
2.01
(NOT USED)
2.02
(NOT USED)
2.03
(NOT USED)
2.04
(NOT USED)
2.05
(NOT USED)
2.06
COMPONENTS
A.
Conduit and sealing fittings:
1. As specified in Section 16130.
B.
Conduit boxes and bodies:
1. As specified in Section 16134.
C.
Wiring devices:
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1.
As specified in Section 16140.
2.07
(NOT USED)
2.08
(NOT USED)
2.09
(NOT USED)
2.10
(NOT USED)
2.11
(NOT USED)
PART 3
EXECUTION
3.01
(NOT USED)
3.02
(NOT USED)
3.03
INSTALLATION
A.
As specified in Section 16050.
B.
Conduit installation:
1. As specified in Section 16130.
2. Wrench tighten all conduit joints to minimize sparking when fault current flows
through the conduit system.
3. Make all conduit connections so that there are a minimum of 5 threads fully
engaged in the connection.
4. Flexible conduit:
a. Class I Division 2 areas:
1) Liquid-tight metal conduit with approved fittings.
b. Maximum length as specified in Section 16130.
C.
Sealing fittings:
1. Provide an approved seal, no more than 12 inches from the enclosure, for all
conduits entering an enclosure containing switches, circuit breakers, fuses,
relays, resistors, or any other apparatus which may produce arcs, sparks, or
high temperatures:
a. Only explosion proof unions, couplings, elbows, capped elbows, and
conduit bodies similar to “L”, “T”, and “X” may be installed between the
sealing fitting and the enclosure.
2. Provide entire assemblies approved for Class I locations for self sealing or
factory sealed assemblies where the equipment that may produce arcs,
sparks, or high temperatures is located in a compartment separate from the
compartment containing splices or taps, and an integral seal is provided where
conductors pass from one compartment to the other:
a. Seals are required in all conduit connections to the compartment
containing splices and must be within 12 inches of the enclosure.
3. Install a conduit seal within 12 inches of the boundary in each conduit run
entering or leaving a classified location. No union, coupling, box, or fitting is
allowed in the conduit between the sealing fitting and the point at which the
conduit leaves the classified location.
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4.
5.
6.
7.
For underground conduits entering or leaving a classified location or between
Separate all conductors within the conduit system and seal using an approved
packing dam installed to both hold the sealing compound and to maintain the
separation between the wires:
a. Remove the outer jacket of multi-conductor non-shielded cables in the
area of the sealing fitting and separate each conductor from the cable and
seal individually.
Install seals with drains in all electrical control stations, low points of conduit or
any place where moisture may condense and accumulate.
Install the sealing compound with a minimum thickness of 5/8 inch or the trade
size of the conduit, whichever is greater.
D.
Boxes and fittings:
1. Class I Division 2 areas:
a. Provide approved grounding bushings on conduits entering and exiting
metallic boxes to bond the conduits together.
E.
Outlet boxes and bodies:
1. Provide conduits bodies and boxes suitable for the conduit system as specified
in Section 16130.
2. Class I Division 2 areas:
a. Boxes not containing arcing parts:
1) Material and NEMA ratings as specified in Section 16050.
2) Pressed metal boxes are not allowed.
b. Provide heavy duty cast construction type conduit fittings and joints:
1) Explosion proof rated fittings and joints are not necessary.
c. Any enclosure containing arcing parts, etc. shall have all construction
associated with the enclosure, conduit system, etc. conforming to Class I
Division 1 construction.
F.
Motor connections:
1. Conduit installation in Class I Division 1 and Class I Division 2 locations for
motors that contain arcing parts, shall proceed as follows:
a. First - Conduit.
b. Second - Explosion proof flexible coupling.
c. Third - Sealing fitting.
d. Fourth - Explosion proof union.
e. Fifth - Connection to the motor terminal box.
2. Wiring connections to motor leads shall be as specified in Section 16150.
3. Bond the non-current-carrying metal parts of equipment, raceways and other
enclosures as required by the NEC to ensure electrical continuity.
3.04
(NOT USED)
3.05
(NOT USED)
3.06
(NOT USED)
3.07
FIELD QUALITY CONTROL
A.
3.08
As specified in Section 16050.
(NOT USED)
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3.09
(NOT USED)
3.10
(NOT USED)
3.11
(NOT USED)
3.12
(NOT USED)
END OF SECTION
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