SECTION 16150
JUNCTION AND PULL BOXES
PART I - GENERAL
1.01
REQUIREMENTS
A.
1.02
SCOPE
A.
1.03
The general provisions of the Contract, including General and Supplementary
Conditions and General Requirements, apply to the work specified in this
Section.
The work covered under this Section shall include furnishing and installing
junction and pull boxes complete for all electrical systems as shown on the
Drawings and herein specified.
QUALITY ASSURANCE
A.
All equipment, material, and their installation shall conform to the requirements
of the National Electrical Code (NEC), local code requirements, and these
Specifications.
B.
All equipment and materials shall be listed by Underwriters Laboratories, Inc.
(UL) for their intended use and shall bear the UL label.
C.
Equipment shall be constructed in accordance with National Electrical
Manufacturer's Association (NEMA) standards.
D.
Submittals are required in accordance with SECTION 16010 of these
specifications.
PART 2 - PRODUCTS
2.01
MATERIALS AND COMPONENTS
A.
Junction and pull boxes shall be provided where indicated and required and shall
be of the type and size for the installation of the electrical system. Junction or
pull boxes not over one hundred (100) cubic inches in volume shall be
constructed in accordance with the requirements of NEC. All junction boxes
shall have removable screwed covers and be accessible after completion of the
building. Removable covers shall not exceed three (3) feet in size in any
direction and split covers shall be used for boxes larger than three (3) feet in any
direction. Where several feeders pass through a common pull box, the feeders
shall be tagged to indicate clearly their electrical characteristics and branch
circuit numbers and panelboard designation. This same information shall be
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JUNCTION AND PULL BOXES
SECTION 16150
stenciled in paint on the cover of each box.
2.02
B.
Pull and junction boxes shall be made of code gauge galvanized sheet steel with
removable screw covers. Minimum size shall be 4 inch x 4 inch x 2-1/8 inches
deep.
C.
Cast metal pull boxes shall be provided in damp or wet locations, with a
gasketed screwed cover, and drilled and tapped holes as required. Screws shall
be brass or bronze.
D.
Pull boxes shall be provided in any conduit run which exceeds one hundred
(100) feet in length, or any run having more than two hundred seventy (270) total
degrees of bend.
UNDERGROUND BOXES AND ENCLOSURES
A.
Underground boxes, enclosures and covers shall conform to all test provisions of
the most current ANSI/SCTE 77 “Specifications For Underground Enclosure
Integrity” for Tier 15 applications. When multiple tiers are specified the boxes
must physically accommodate and structurally support compatible covers while
possessing the highest Tier rating. In no assembly can the cover design load
exceed the design load of the box. All components in an assembly (box and
cover) shall be manufactured using matched surface tooling. All covers are
required to have a minimum coefficient of friction of 0.05 in accordance with
ASTM C1028 and the corresponding Tier level embossed on the top surface.
Assemblies not U.L. Listed shall have independent third party verification or test
reports stamped by a registered Professional Engineer certifying that all test
provisions of this specification have been met are required with each submittal.
B.
Underground boxes, enclosures and covers shall be as manufactured by
QUAZITE or approved equal.
1.
Telephone Service inground enclosure box and cover shall be QUAZITE
Cat. No. PG3048BA36 box with Cat. No. PG3048HS0043 cover.
2.
CATV Service inground enclosure box and cover shall be QUAZITE Cat.
No. PG3048BA36 box with Cat. No. PG3048HS0010 cover.
3.
Sports Field Lighting Pole ground rod hand hole enclosure box and cover
shall be QUAZITE Cat. No. PG1118BA18 box with Cat. No.
PG1118CA0024 cover.
4.
Other applications requiring the use of exterior underground boxes or
enclosures shall use QUATIZE “PG” Series enclosure boxes
appropriately sized complete with the proper cover with logo designating
the use of the box or enclosure.
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JUNCTION AND PULL BOXES
SECTION 16150
PART 3 - EXECUTION
3.01
INSTALLATION
A.
Pull and junction boxes shall be installed where indicated on the Drawings or as
herein specified. Boxes shall be located so as to be inaccessible to the general
public.
B.
All boxes and conductors therein shall be marked as hereinbefore specified to
indicate the voltage and circuit numbers.
C.
Boxes shall not be fastened in place with drive pins and/or other methods using
compressed air or gases.
D.
Boxes located under roof decking shall not be less than 1½ inches from the
nearest surface of the roof decking.
E.
Pull and junction boxes shall be concealed except in electrical and mechanical
equipment rooms, spaces architecturally designed to have an open structure
without ceilings or as otherwise indicated on the Drawings.
F.
All system pull and junction box covers shall be painted as follows:
1.
120/208 Volt
- Black
2.
277/480 Volt
- Orange
3.
Clocks and Program Clocks
- Green
4.
Emergency
- White
5.
Fire Alarm
- Red
6.
Security System
- Gray
7.
Sound
- Blue
8.
Telecommunications
- Yellow
9.
Cable Television/Broadband
- Tan
10.
Cox Communications I-NET (fiber)
- Purple
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JUNCTION AND PULL BOXES
3.02
UNDERGROUND BOXES AND ENCLOSURES
A.
3.03
3.04
SECTION 16150
Exterior underground boxes and enclosures shall be installed per manufacturer’s
recommendations and the following minimum requirements:
1.
After the proper location of the underground enclosure has been
established and the conduits, underground cables or ground rods, etc.
are installed or located, the hole for the enclosure shall be excavated and
shall be at least six (6) to eight (8) inches deeper that the depth of the
enclosure and shall have a minimum of six (6) inches of gravel in the
bottom of the hole or as shown on the Drawings. The gravel base shall
extend past the side walls of the enclosure by at least four (4) to six (6)
inches. Once the enclosure is positioned on top of the gravel base and
the elevation check, the enclosure shall be back-filled.
2.
Back-filling shall have 95% compaction or greater.
3.
Provide internal bracing during back-filling to ensure minimal box sidewall
deflections. Bracing supports shall be 2x4’s or similar material sized to
hold the box at mid-depth.
4.
Top of the box and cover shall be flush with the finished grade.
CONDUCTORS
A.
All conductors entering junction and pull boxes shall be of the same voltage. Do
not mix voltages regardless of the conductors’ voltage rating, unless specifically
shown on the Drawings.
B.
Branch circuit conductors and feeder conductors shall not occupy the same
junction or pull box. Maintain separate boxes for branch circuits and separate
boxes for feeders, unless specifically shown otherwise on the drawings.
ARC-PROOFING
A.
All feeders entering a pull box containing more than one (1) feeder, or more than
one (1) parallel feeder, shall be arc-proofed as follows. Conductors of the same
feeder, including each set of a parallel feeder, shall be tightly grouped together
and held in place with random wrapped 3M No. 33 Tape. Grouped cables shall
be arc proofed using spirally wound one half-lapped layer of 3M No. 77 Fire and
Arc-Proofed Tape which shall be held in place with random wrapped 3M No. 69
Glass Cloth Electrical Tape.
END OF SECTION
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