Fault Finding; Preliminary Electrical Systems Check - Tricity Bendix HG 250 Instruction Booklet

FAULT FINDING

PRELIMINARY ELECTRICAL SYSTEMS
CHECK
Blue
Brown
Green
Yellow
Blue
Green
Brown
Yellow
START
Isolate appliance
and carry out:
A: Earth Continuity
check.
NO YES
Carry out:
C: Polarity check.
Has inlet fuse blown?
YES
NO
Inlet wiring
faulty.
Rectify any
fault.
Isolate appliance and
carry out:
B: Insulation check.
Rectify any fault
including replacing
fuses as necessary.
PLUG (with cover removed)
Earth Wire
( )
Green/Yellow
Neutral Wire
Blue
Carry out:
D: Resistance to
Earth check.
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
all earth wires for continuity and all
contacts clean and tight.
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
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.
SOCKET
(face view)
( )
E
N
L
Electricity supply
should now be
satisfactory.
(Ohms) x 1
(Ohm), check
(Ohms) x 1 scale.
(Ohm) x 100 scale.
(infinity) there
17