A. Visual and Mechanical Inspection:

1. Inspect the components for damage and errors in polarity or conductor routing.
2. Verify that the ground connection is made on the source side of the neutral disconnect link and also on the source side of any ground fault sensor.
3. Verify that the neutral sensors are connected with correct polarity on both primary and secondary.
4. Verify that all phase conductors and the neutral pass through the sensor in the same direction for zero sequence systems.
5. Verify that grounding conductors do not pass through the zero sequence sensors.
6. Verify that the grounded conductor is solidly grounded.
7. Prior to cleaning the unit, perform as-found tests.
8. Verify the unit is clean.
9. Inspect bolted electrical connections for high resistance using one or more of the following methods:
1. Use of low-resistance ohmmeter in accordance with Section 7.14.B.1.
2. Verify tightness of accessible bolted electrical connections by calibrated torquewrench method in accordance with manufacturer’s published data or Table 100.12.
1. Verify correct operation of all functions of the self-test panel.
2. Verify pickup and time-delay settings in accordance with the settings provided in the owner’s specifications. Record appropriate operation and test sequences as required by NFPA 70 National Electrical Code, Article 230.95.
3. perform as-left tests.

B. Electrical Tests:

1. Perform resistance measurements through bolted connections with a low-resistance ohmmeter in accordance with Section 7.14.A.4.1.
2. Measure the system neutral-to-ground insulation resistance with the neutral disconnect link temporarily removed. Replace neutral disconnect link after testing.
3. *Perform insulation-resistance tests on all control wiring with respect to ground. The applied potential shall be 500 volts dc for 300-volt rated cable and 1000 volts dc for 600-volt rated cable. Test duration shall be one minute. For units with solid-state components or control devices that cannot tolerate the applied voltage, follow manufacturer’s recommendation.
4. Perform ground fault protective device pickup tests using primary current injection.
5. For summation type systems utilizing phase and neutral current transformers, verify correct polarities by applying current to each phase-neutral current transformer pair. This test also applies to molded-case breakers utilizing an external neutral current transformer.
6. Measure time delay of the ground fault protective device at a value equal to or greater than 150 percent of the pickup value.
7. Verify that reduced control voltage tripping capability is 55 percent for ac systems and 80 percent for dc systems.
8. Verify blocking capability of zone interlock systems.

C. Test Values – Visual and Mechanical

1. Compare bolted connection resistance values to values of similar connections. Investigate values which deviate from those of similar bolted connections by more than 50 percent of the lowest value. (7.14.A.4.1)
2. Bolt-torque levels should be in accordance with manufacturer’s published data. In the absence of manufacturer’s published data, use Table 100.12. (7.14.A.4.2)

D. Test Values – Electrical

1. Compare bolted connection resistance values to values of similar connections. Investigate values which deviate from those of similar bolted connections by more than 50 percent of the lowest value.
2. System neutral-to-ground insulation resistance should be a minimum of one megohm.
3. Insulation-resistance values of control wiring should be comparable to previously obtained results but not less than two megohms.
4. Results of pickup test should be greater than 90 percent of the ground fault protection device pickup setting and less than 1200 amperes or 125 percent of the pickup setting, whichever is smaller.
5. The ground fault protective device should operate when current direction is the same relative to polarity marks in the two current transformers. The ground fault protective device should not operate when current direction is opposite relative to polarity marks in the two current transformers.
6. Relay timing should be in accordance with manufacturer’s specifications but must be no longer than one second at 3000 amperes in accordance with NFPA 70, National Electrical Code, Article 230.95.
7. The circuit interrupting device should operate when control voltage is 55 percent of nominal voltage for ac circuits and 80 percent of nominal voltage for dc circuits.
8. Results of zone-blocking tests should be in accordance with manufacturer’s published data and/or design specifications.