Preliminary Electrical Systems Check
and carry out:
A: Earth Continuity
C: Polarity check.
Has inlet fuse blown?
Isolate appliance and
B: Insulation check.
Rectify any fault
fuses as necessary.
PLUG (with cover removed)
D: Resistance to
A. EARTH CONTINUITY CHECK -
Appliance must be electrically
disconnected - meter set on
scale and adjust zero if necessary.
a) Test leads from any appliance earth point
to earth pin on plug. Resistance should
be less than 0.1
wires for continuity and all contacts clean
B. INSULATION CHECK - Appliance
electrically disconnected, all switches ON.
a) meter set on
Test leads from L to N in appliance
terminal block. If meter reads «0» then
there is a short circuit.
b) meter set on
Repeat test with leads from L to E. If meter
reads less than
NOTE - Should it be found that the fuse
has failed but no fault is indicated - a
detailed continuity check (i.e. by
disconnecting and checking each
component) is required to trace the faulty
It is possible that a fault could occur as a
result of local burning/arcing but no fault
could be found under test. However a
detailed visual inspection should reveal
evidence of burning around the fault.
should now be
(Ohms) x 1
(Ohm), check all earth
(Ohms) x 1 scale.
(Ohm) x 100 scale.
(infinity) there is a fault.