20
A. EARTH CONTINUITY CHECK
Appliance must be electrically disconnected - meter set on
Ω
(Ohms) x 1 scale and
adjust zero if necessary.
— Test leads from any appliance earth point to earth pin on plug. Resistance should be
less than 0.1
Ω
(Ohm), check all earth wires for continuity and all contacts are clean
and tight.
B. INSULATION CHECK
Appliance electrically disconnected, all switches ON.
a) meter set on
Ω
(Ohms) x 1 scale.
Test leads from L to N in appliance terminal block. If meter reads «0» then there is a
short circuit.
b) meter set on
Ω
(Ohm) x 100 scale.
Repeat test with leads from L to E. If meter reads less than
∞
(infinity) there is a fault.
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
component.
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.
