NOTE: Any pinhole, cut, scratch or other damage to
the anode cable exposing bare copper to the
electrolyte will result in early failure of the
cathodic protection system. For this reason,
special, extra heavy insulation is used on anode
cable. While it is often expedient to use the same
type wire for the cathodic (negative) cable in order
to avoid a mix-up in the field, the cathode cable is
not subject to anodic failure and lesser insulation
can be used.
**************************************************************************
Anode connecting wire shall be No. [8] [_____] AWG stranded copper wire
with type CP high molecular weight polyethylene insulation, 2.8 mm 7/64 inch
thick, 600 volt rating. Cable-to-anode contact resistance shall be 0.003
ohms maximum. Deep anode ground bed connecting wire shall be No. 8 AWG,
stranded copper wire with an inner jacket of 1 mm 40 mils of Halar
insulation covered by an outer jacket of 1.6 mm 65 mils CP high molecular
weight polyethylene insulation, 600 volt rating. Cable-to-anode contact
resistance shall be 0.02 ohms maximum.
2.4.1.2
Anode Header Cable
**************************************************************************
NOTE: The double insulated fluorocopolymer cable is
intended for use in very harsh environments such as
deep anode bed installations where clorine and
hydrogen gases are generated. This cable can be
installed directly in soil or submerged in fresh,
brackish, or salt waters. The CP high molecular
weight polyethylene cable is also a direct buried
and submergible type cable suitable for harsh
environments, but not as quiet as durable as the
double insulated cable would be in the toughest of
environments.
**************************************************************************
Cable for anode header and distribution shall be No. [_____] AWG stranded
copper wire with type [CP high molecular weight polyethylene, 2.8 mm 7/64
inch thick insulation] [HMWPE protective jacketed cable with a
fluorocopolymer inner or primary insulation], 600-volt rating.
2.4.1.3
Test Wires
Test wires shall be No. 12 AWG stranded copper wire with NFPA 70 Type TW or
RHW or polyethylene insulation.
2.4.1.4
Resistance Wire
Resistance wire shall be AWG No. [16 or No. 22] [_____] nickel-chromium
wire.
2.4.2
Deep Anode Ground Bed Casing
**************************************************************************
NOTE: A metal casing should not be used except for
a maximum of 1.5 meter (5 feet) at the top for a
well cap which also serves as a support for the
suspension ropes. The drilling mud on the sides of
SECTION 13112A
Page 19
Previous Page
