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After a leak is located, a repair can be made in accordance with section VI.

(2) Satisfactory gas pressure. If the pressure is satisfactory, do not re-energize the circuit until the fault has been located and repaired, since the high fault current reimposed on the failed cable can further damage the cable.

5-13. Determining type of cable fault.

Use fault locating equipment when a check of associated equipment and lines confirms that the fault is actually in the cable, and visual methods fail to locate the fault. Since no single test will locate all types of faults, the type of fault must be determined in order to use the best test method to locate it. To determine the type of fault, any source of direct-current voltage can be used with a voltmeter or a suitable low-voltage lamp. A portable testing set, such as a multimeter of the volt-ohm meter (VOM) type is most commonly used. The section of cable under test must be disconnected from feeders, buses, and equipment. Alternating current should not be used, because the charging current of the cable is sufficient to prevent accurate indications of the condition of the cable.

a. Types of faults. Cable insulation failures result in low- or high-resistance faults, because one or a combination of the following conditions occur.

(1) One or more of the conductors may be grounded.

(2) Two or more conductors may be short circuited.

(3) One or more conductors may be open circuited.

b. Checking for fault types.

(1) Grounded conductor.

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