Before conducting tests on a cable system, verify that the cable system is properly de-energized. If the system has been previously energized, follow the prescribed rules for switching necessary to de-energize, lockout, tag, and ground the cable system. The personnel conducting the testing must be qualified to operate the test equipment and be familiar with the cable system and its components.
Disconnect cables from non-cable system equipment and apparatus. This will reduce the possibility of erroneous test results. In the case of HVDC (High-Voltage-Direct-Current) testing, it will prevent damage to equipment and apparatus. Adequate physical clearances between the cable ends, and other equipment, other energized conductors, and to electrical ground must be checked. During the testing, be sure that unauthorized access to the cable system is maintained. Verify that proper procedures are taken to clear all tap(s) or lateral(s) in the circuit. Remove grounds from the cable phase to be tested. Phases not under test should remain grounded at all ends.
DC High Voltage Test Data:
| Insulation Level | Test Voltage | Dimension | |
| A | B | ||
| 5kV 100% & 133% Insulation Level | 25kV DC | 14" | 10" |
| 8kV 100% & 133% Insulation Level | 35kV DC | 16" | 12" |
| 15kV 100% Insulation Level | 55kV DC | 28" | 14" |
| 15kV 133% Insulation Level | 65kV DC | 20" | 16" |
| 25kV 100% Insulation Level | 80kV DC | 21" | 17" |
| 25kV 133% Insulation Level | 100kV DC | 24" | 20" |
| 28kV 100% Insulation Level | 85kV DC | 22" | 18" |
| 35kV 100% Insulation Level | 100kV DC | 24" | 20" |
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Conduct test according to prescribed procedures and instructions. Record test results and retain for future reference.
High potential tests are "go no-go" tests. The cable is required to withstand the specified voltage for the specified time duration. These tests will normally reveal gross imperfections due to improper field handling. Recommended test voltages are given in tables for dc and ac. Alternating current new installation test voltages are 80% of the factory test voltage. Direct current voltages are two times the ac new installation test voltage. Test duration should not exceed 5 minutes.
1. Remove jacket to Dimension "A"
2. Remove shield to within 2" of jacket
3. Remove insulation semicon to within 1" of shield:
a) Score extruded semicon around cable at point "C-C"
b) Score longitudinal strips 3/8" wide, around cable
c) Grasp end with needle-nose pliers and peel back
4. Clean insulation with isopropyl alcohol
5. Remove 1" insulation from cable end