Besantek BST-ET14, Instruction Manual

Page: 20 / 28

-18-
10. Very Important Features
(1) Checking Circuit Breaker Integrity
To ensure proper diagnostic is done, it is very
important to check the ELCB/RCD as a component
before testing an installation which has wiring
connected to it.
Wiring could be faulty and may cause an insulation
fault. Therefore, it is important to ensure that the
ELCB/RCD is tested alone first to ascertain that the
ELCB/RCD is in proper working condition.
Only after having done so, should you test wiring in-
circuit.
(2) Finding Standing Leakage in an installation
To find a standing fault, always check one circuit at a
time to find the faulty circuit easily.
Disconnect all the circuits by switching all the
insulators OFF.
The ELCB/RCD must be checked individually before
proceeding (see above), for its integrity.
Once you know for sure that the ELCB/RCD is ok,
then proceed to test one circuit at a time and write
down the results at which the ELCB/RCD trips. This
should give you a very good idea which circuit is
faulty which circuit has standing leakage current.