tested in accordance with "First Test on New Circuits" in table above.
To
ensure reliable operation, complete circuit shall be tested at reduced
voltages indicated above.
b.
Leakage Current: Insulation leakage current shall be measured and
recorded for each circuit after a 1 minute application of the test
voltage. If leakage current exceeds values specified below, the
circuit shall be sectionalized and retested and the defective
parts shall be repaired or replaced. Leakage current limits
include allowances for the normal number of connectors and splices
for each circuit as follows:
(1)
Three microamperes for each 300 m 1000 feet of cable.
(2) Two microamperes for each 200 watt and each 500 watt
5,000-volt series transformer.
(3) Two microamperes for each 30/45-Watt 5,000 volt series
If measured value of insulation leakage current exceeds calculated value,
the circuit shall be sectionalized and tested as specified for each
section. Defective components shall be repaired or replaced until repeated
tests indicate an acceptable value of leakage current for the entire
circuit.
3.22.6
Constant Current Regulators
Each constant current regulator shall be examined to ensure that porcelain
bushings are not cracked, no shipping damage has occurred, internal and
external connections are correct, switches and relays operate freely and
are not tied or blocked, fuses, if required, are correct, and liquid level
of liquid-filled regulators is correct. Relay panel covers shall be
removed only for this examination; it is not necessary to open the main
tank of liquid-filled regulators. The instructions on the plates attached
to the regulators shall be followed. Covers shall be replaced tightly
after completing examinations and tests.
3.22.7
Regulator Electrical Tests
Supply voltage and input tap shall correspond. With the loads
disconnected, regulator shall be energized and the open circuit protector
observed to ensure that it de-energizes the regulator within 3 seconds.
After testing circuits for open circuit and ground fault and corrections,
if any, and after determining that lamps are serviceable and in place, the
loads shall be connected for each circuit or combination of circuits to be
energized by the regulator and the voltage and current measured
an accuracy of plus or minus 1 percent of meter full scale. Readings shall
be recorded during the day and night in order to obtain the average supply
voltage. Output current on each brightness tap shall be within plus or
minus 2 percent full scale of the nameplate values after making necessary
correction in the supply voltage. Late model regulators have automatic
supply voltage correction in lieu of input taps, and output current does
not change as supply voltage varies. When output current on highest
intensity setting deviates from nameplate value by more than 2 percent of
meter full scale and the regulator is not overloaded, internal adjustment
shall be checked as described on regulator instruction plate. Since
adjustment may be rather delicate, a deviation of up to plus or minus 5
SECTION 16526A
Page 44
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