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Scotch ? Fire-Retardant Electric Arc Proofing Tape 77 Series
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Coverage Table
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Cable O.D.
(inches)
1”
1 ?”
1 ?”
1 ?”
2”
2 ?”
2 ?”
2 ?”
3”
3 ?”
4”
4 ?”
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Tape Width (inches)
1 ?”
1 ?”
1 ?”
3”
3’
3”
3”
3”
3”
3”
3”
3”
Number of 20 foot rolls needed
to cover 100 feet of cable with
one-half lap wrap (rolls)
21
27
32
19
20
24
27
29
32
37
42
48
Use this formula to determine the quantity of Scotch ? Tape 77 required to cover cables with a half-lap wrap:
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C = Circumference (C = π D)
π = 3.14
D = Cable O.D. in Inches
LC = Length of Cable in Inches
W = width of Tape in Inches (minus ? tape width)
LT = Length of Tape in Inches
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(C) (LC ) = Number of Rolls Required
(LT) (W)
Product
Specifications
Scotch ? Electric Arc Proofing Tape 77 Series shall consist of a flexible, conformable,
unsupported intumescent elastomer. The tape shall be 0.030 inches thick and be
capable of over 100% elongation. The tape shall be non-corrosive to metallic cable
sheaths and compatible with synthetic cable jackets (i.e. semiconducting URD type,
polyethylene, PVC, etc.). It shall be self-extinguishing and shall not support
combustion. The tape is resistant to water, salt water, gases, and sewage.
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Engineering and
Architectural
Specification
High-energy cable, important communication and control cables in manholes, vaults,
on open cable trays or other exposed locations where threat of fault can occur, shall
be arc proofed with one half-lapped layer of Scotch ? Fire-Retardant Electric Arc
Proofing Tape 77 Black or 77 White.
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Installation
Technique
Wrap Scotch ? Tape 77 Black or 77 White in half-lapped layers. The tape should be
stretched slightly to obtain a snug, virtually wrinkle-free wrap which conforms to the
cable. Overlap the last 6 inches of protected cable when starting a new roll of tape.
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Since the Scotch ? Tape 77 Series is not adhesive coated, it must be held in place
after wrapping with bands of Scotch ? Glass Cloth Electrical Tape 69. The most
effective and economical way to hold either of these tapes in place is by banding (2
complete wraps) the first and last applied wrap.
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