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56
Linea Plus AG
PRELIMINARY ELECTRICAL SYSTEM CHECKS
A. EARTH CONTINUITY CHECK - appliance must be
electrically disconnected - meter set on
Ω
(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 1
Ω
(ohm).
If the resistance is greater than 1
Ω
(ohm) check all earth
wires for continuity and all contacts clean and tight.
B. SHORT CIRCUIT CHECK - appliance electrically
disconnected, all switches ON (including stats) -
a) meter set on
Ω
(ohms) x 1 scale.
Test leads from L to N in appliance terminal strip/block
- if meter reads 0 then there is a short circuit.
b) meter set on
Ω
(ohms) 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 re-
quired 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.
C. POLARITY CHECK
Appliance connected to mains supply and meter set on
300V ac scale. Test at appliance terminal strip:-
a) Test leads from L to N - meter reads approx 230V ac
b) Test leads from L to E ( ) - meter reads approx
230 V ac
c) Test leads from N to E ( ) - meter reads from O-15V
ac*
Thus the terminal marked L is the live terminal. If the low*
V ac reading is given on terminals other than N to E ( )
there is an electrical fault.
Repeat the test at the appliance plug/inlet spur to check
the wiring system up to the appliance and rectify any
fault. If necessary repeat the test at the supply system
socket/spur - if the fault also occurs at this stage then
there is a house system fault which requires attention by
the ELECTRICITY AUTHORITY. The customer should
be warned not to use the appliance until this examina-
tion has been carried out.
D. RESISTANCE TO EARTH CHECK
Appliance must be disconnected from mains supply and
meter set on
Ω
(ohms) x 100 scale. All switches,
including stats, ON - Test leads from L to E - if meter
reads other than infinity (
∝
) there is a fault which should
be isolated. A detailed continuity check is required to
trace the faulty component.
IMPORTANT - This series of checks are the first
electrical checks to be carried out during a fault finding
procedure. On completion of the service/fault finding
task which has required the breaking and remaking of
electrical connections then the checks - A. Earth Conti-
nuity. C. Polarity and D. Resistance to Earth - must be
repeated.