UFC 3-535-01
17 November 2005
Table 14-9. Cable/Circuit Test Procedures
First Test on
Succeeding
New Circuit
Old Circuit
Complete Approach System (5,000V leads, 500
and 300W transformers)
1.5 x max. working V
1,000V
Touchdown Zone and Center-line Light Circuits
(5,000V leads, 200W transformers)
1.5 x max. working V
1,000V
High Intensity Runway Edge Light Circuits,
(5,000V leads, 500 and 200W transformers)
1.5 x max. working V
1,000V
Medium Intensity Runway and Taxiway Circuits
(5,000V leads and 30/45W transformers)
1.5 x max. working V
1,000V
600 Volt Circuits
1.5 x max. working V
600V
14-5.2.2
The above tests must be performed with a suitable high voltage DC tester
that has a steady, filtered output voltage. The high voltage tester must have an accurate
voltmeter and microammeter for reading the voltage applied to the circuit and the
insulation leakage current.
14-5.2.3
All high voltage tests on airfield lighting circuits must be carefully
supervised by qualified government personnel to ensure that excessive voltages are not
applied to circuits.
14-5.2.4
During the last minute of the above tests, the insulation leakage current in
microamperes for each complete circuit must not exceed the following value calculated
for each circuit:
14-5.2.4.1 Allow 2 microamperes for each 30/45, 100, 200, 300 and 500W series
transformer tested at voltage shown in Table 14-9.
14-5.2.4.2 Allow one microamperes for each 300 feet of cable tested at voltage
shown in Table 14-9. This value includes allowances for the normal number of
connectors and splices.
14-5.2.4.3 Using a 1000 volt DC crank-type megger, each circuit must measure
above 30 megohms to be satisfactory.
14-5.2.5
If the leakage current exceeds the value calculated as outlined above, the
circuit must be sectionalized and the above test repeated for each section. Defective
components must be located and repaired or replaced until the entire circuit passes the
test.
14-5.2.6
Make sure the test voltage specified in paragraph 14-5.2.1 is applied to a
circuit in the final acceptance test. The voltage should be adjusted so the voltmeter
reads the desired value before the leakage current is read. If there is a difficulty in
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