Pat South Wales

PAT Testing, In-Service Testing

The IEE Code of Practice recognises four test situations.

• Type Testing to an appropriate standard
• Production testing
• In-Service testing
• Testing after repair

This document is limited in covering topics concerned with In Service Testing only.

This is the testing carried out as a routine to determine whether the equipment is in a satisfactory condition.

In-Service testing will involve the following:

(a) Preliminary inspection

(b) Earth continuity tests (for Class 1 equipment)

(c) Insulation testing (Which may sometimes be substituted by earth leakage measurement)

(d) Functional checks.

Electrical testing should be performed by a person who is competent in the safe use of the test equipment and who knows how to interpret the test results obtained. This person must be capable of inspecting the equipment and, where necessary, dismantling it to check the cable connections.