10
Fault Finding
Fault Finding
Fault Finding
Fault Finding
Fault Finding
Pr
Pr
Pr
Pr
Preliminar
eliminar
eliminar
eliminar
eliminary Electrical
y Electrical
y Electrical
y Electrical
y Electrical
Systems Check
Systems Check
Systems Check
Systems Check
Systems Check
Brown
Blue
Green
Green
Brown
Blue
A.
A.
A.
A.
A. EAR
EAR
EAR
EAR
EARTH CONTINUITY CHECK
TH CONTINUITY CHECK
TH CONTINUITY CHECK
TH CONTINUITY CHECK
TH CONTINUITY CHECK
Appliance must be electrically disconnected -
meter set on W (Ohms) x 1 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 W (Ohm), check all earth wires for continuity
and all contacts clean and tight.
B.
B.
B.
B.
B. INSULA
INSULA
INSULA
INSULA
INSULATION CHECK
TION CHECK
TION CHECK
TION CHECK
TION CHECK
Appliance electrically disconnected, all switches
ON.
a) meter set on W (Ohms) x 1 scale.
Te s t
leads from L to N in appliance terminal block. If
meter reads «0» then there is a short circuit.
b) meter set on W (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.
Electricity supply
should now be
satisfactory.
START
START
START
START
START
Isolate appliance
and carry out:
A:
A:
A:
A:
A: Earth Continuity
check.
Has inlet fuse blown?
Carry out:
B:
B:
B:
B:
B: Insulation
check.
Inlet wiring
faulty.
Rectify any
fault.
Isolate appliance and
carry out:
B:
B:
B:
B:
B: Insulation check.
Rectify any fault
including replacing
fuses as necessary.
N O
N O
N O
N O
N O
Y E S
Y E S
Y E S
Y E S
Y E S
N O
N O
N O
N O
N O
Y E S
Y E S
Y E S
Y E S
Y E S
