2.3.6
Pressure-Sensitive Vinyl Tape
Tape shall conform to UL 510.
PART 3
EXECUTION
3.1
ANODES
3.1.1
Anode Installation
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NOTE: In water tanks, split bolts are used (above
the waterline only) because working space is limited
and hydraulic or mechanical compression tools may be
cumbersome and hazardous to use; since a single
split-bolt will work loose when the wires it
connects are moved, a minimum of two split bolts
should be used. At ground level or in trenches,
compression tools can be used conveniently, and the
swaged sleeve connection produced by such tools is
more reliable than split bolts.
In icy climates, a single split bolt connection
should not be used above the water line in water
tanks. One of the other methods described above
should be utilized.
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Anodes shall be suspended to prevent icing damage to anodes and suspending
cables. Anodes shall be suspended from roof [plate] [structural members]
by means of factory installed connecting wire designed to support the
anodes in air (before submergence) without failure of the electrical wire
insulation or the electrical conductor. Anodes shall be suspended
preventing contact with tank surfaces and shall be hung clear of man-access
roof hatches and such items as ladders, heater pipes, and stay rods. Anode
hangers shall electrically insulate the anode suspending wire from the tank
steel. A handhole having a minimum diameter of 150 mm 6 inches shall be
provided in the tank roof for each anode string to permit replacement or
inspection of anodes. The Contractor shall certify that the method chosen
has been used successfully for similar applications.
3.1.2
Anode Connections
Anodes shall be electrically connected to the positive dc header cable with
compression connectors or split bolts, or the header cable may terminate in
a junction box for connection with all anode cables. A minimum of two
split bolts shall be used for each connection if split bolts are used.
Header cable shall be installed on the underside of the roof with
electrically insulating hangers and shall enter the tank near the roof line
from an externally mounted junction box. External wiring shall be in
conduit. All under-roof electric wire splices shall be made above the high
water line and sealed water tight using a minimum of two 1/2-lap layers of
butyl rubber tape followed by two 1/2-lap layers of plastic tape.
3.2
RECTIFIERS
3.2.1
Rectifier and Control Installation
Mounting shall be [of the wall mounted type.] [of the cross-arm mounted
SECTION 13111A
Page 17
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