13
CAST CABLE SPLICE:
1. To prepare the 3-conductor power cable for splicing,
insert a sharp knife blade between the cable jacket and
lead insulation and strip the jacket back 2
1
/
2
" from the
end. Taking care not to cut the lead insulation. Strip
the cambric wrapping (if any) off the conductors and
strip back rubber insulation
5
/
8
" from the end. Assem-
ble the cable connectors and crimp them in place using
a crimping tool.
2. Cut off the motor leads to equal length. Clean off the
ends of the leads for about a foot, using a cloth wet
with gasoline or solvent. Clean the end of the power
cable also. Insert the three motor leads into the cor-
responding holes in the bottom of the rubber casing
and push them several inches out the top. Crimp the
motor leads into the corresponding connectors, crimp-
ing the center one first. Bend the cables into line with
the holes in the casing and slip the casing up until the
connectors are inside the holes and about
1
/
4
" from the
top.
3. Mix the resin as directed. Cut off a corner of the bag
and squeeze all of the resin into casing. With the roll
of tape on hand, fold the bag and tape the top of the
bag snuggly to the power cable until the resin runs
out over the top. This will assure maximum coverage
of the resin and minimum size of the finished splice.
When the resin is firm to touch, the splice may be im-
mersed for testing.
APPENDIX C — ELECTRICAL TESTS
1. MEASURING INSULATION RESISTANCE
(GROUND TEST)
The condition of the insulation around a conductor
can be determined by measuring the electrical resis-
tance between the conductor and ground. This mea-
surement can be made with a megger or an ohmmeter.
The value is stated in ohms or megohms (ohms x
1,000,000). High ohm values indicate good insulation.
The basic procedure for measuring insulation resis-
tance is given below:
A. Turn off all power and disconnect the leads to be
tested from the electrical panel. Lock out the panel.
FAILURE TO TURN OFF THE POWER
WILL DAMAGE THE METER AND
CAN CAUSE SERIOUS OR FATAL SHOCK.
Failure to disconnect the leads can result in false
readings.
B. Set the meter selector knob to RX 100K or RX
100,000 (some meters may not have RX 100K
in which case EX 10K or EX 10,000 scale can be
used). Clip the meter leads together and adjust the
meter to zero.
C. Unclip the leads and attach one of the meter leads
to one of the power cable leads or motor leads. The
other meter to the ground.
D. Do not touch any bare wires or allow bare wires
to come in contact with the ground or metal. False
readings will result.
E. If the meter needle is at either extreme end of the
scale, a more accurate reading can be obtained
by switching the selector switch to another scale.
Rezero the meter each time the selector switch is
moved.
The readings obtained from power cables and mo-
tor leads should be within the range specified in Table
C.1. Low readings indicate that the motor windings are
grounded or that the cable or splice insulation is dam-
aged. If low or marginal readings are obtained on a new
installation the problem should be corrected before
proceeding with the installation.
2. MEASURING RESISTANCE BETWEEN LEADS
(MOTOR WINDING RESISTANCE)
The general conditions of motor windings can be
determined by measuring the resistance of the motor
windings (i.e. the resistance between the motor leads)
and comparing the measured resistance with values
given in the motor manual. The resistance is measured
with an ohmmeter and the value is stated in ohms.
The basic procedure for measuring motor winding
resistance is given below:
A. Turn off the power and disconnect the leads to be
tested from the panel. Lock out the panel.
FAILURE TO TURN OFF THE POWER
WILL DAMAGE THE METER AND
CAN CAUSE SERIOUS OR FATAL ELECTRICAL
SHOCK.
Failure to disconnect the leads can result in false
readings.
B. Set the meter selector knob to 'RX 1'. Clip the me-
ter leads together and adjust the meter to zero.
C. Unclip the meter leads and attach them to the
motor leads.
Resistance measured between the motor leads prior to
splicing the power cable to the motor leads should be
within the motor winding resistance limits specified in
the motor manual.
DANGER
DANGER
