B&K Precision 307A - Manual - Manual (Page 7)

6. Why test is necessary ?
INSULATION
Every electrical apparatus and installation need to be safe
for the user and for the equipment itself.
Electrical conductors of electricity need to be insulated
from each other, so that they do not create electrical
hazard or unnecessary consumption.
Badly insulated circuits can create leakage current which
can be dangerous and trip your GFCI, RCCB or ELCB..
Each country regulate those levels at which the insulation
is acceptable.
Generally, Insulation resistance measurements are done
between each conductor and the earth, and between
each conductors.
CONTINUITY
Checking the continuity of wires, complete circuits,
connections, closure of contacts, circuit breakers, fuses,
bounding resistance of connections, etc... Are all very
important.
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