Test Procedure For Bus Bar

1.      PURPOSE:                      The purpose of this procedure is to verify functions of   Metal Enclosed Bus Duct.

2.      APPLICABILITY:        This procedure applies to all types of Metal Enclosed Bus Duct.

3.      DEFINITIONS:              Non

4.      FORM:                             Site Test Report For Metal Enclosed Bus Duct.

5.      REFERENCES: 

All inspections and tests shall utilize the following references;

A.                Project design drawings and specifications

B.                 Manufacturer’s instruction manuals applicable to each particular apparatus.

6.      STANDARDS: 

The following codes and standards apply,

A.                National Electrical Testing Association: NETA

B.                 Institute of Electrical and Electronic Engineers: IEEE.

7.      EQUIPMENTS REQUIRED:

1)                  Megger.

2)                  DLRO.

3)                  Digital Multimeter.

4)                  Phase Sequence Meter.

5)                  Hi-Pot Test Set.

8.      PROCEDURE:

SAFETY PRECAUTIONS:

Always refer to instruction manuals of test equipment used for detailed safety instructions and precautions.

MECHANICAL CHECK AND VISUAL INSPECTION:

1.      Inspect for physical damage/defects.

2.      Check bus arrangement for conformance with approved drawings.

3.      Check tightness of all bolted connections (torque wrench method).

4.      Check that all enclosure grounding is securely connected.

5.      Inspect internal compartments for cleanliness (free from dust and moisture).

6.      Check for watertight seals at all joints including expanding interface points.

7.      Check bus conductor support insulators for cracked insulation chipped porcelain etc

8.      Check quality of paint work (inside and outside)

9.      Check that ventilation openings are not blocked and screened against ingress of insects and rain.

10.  Moisture drain holes available at bottom of enclosure.

11.  Check anti-condensation heaters mounted at the correct locations (Bottom)

      ELECTRICAL TESTS :

1.      Phasing check Ensure correct phase identification

2.      Continuity check

3.      Bus joint resistance (at 100 A DC)

4.      Insulation resistance test.

5.      Hi-pot test (to ground and between phases)

6.      Heaters and thermostats functional test Measure the heater currents.

9.       ACCEPTANCE  CRITERION :

Check the Test results against applicable standards and/or manufacturer’s instructions.