• Plug the supplied 0.5m red IEC lead into the IEC
socket and into a mains outlet on the
extension lead. Plug the mains plug of the
extension lead into the front panel mains socket
on the PrimeTest 100.
• The extension lead can now be tested in the
same manner as an IEC as described above.
Note: The protective earth resistance will depend
upon the length of the extension lead and the
size (cross sectional area) of the cable. The
measured value maybe be acceptable even if a
cross is shown next to the R
PE
enunciator.
Table 1: Approximate resistance of protective
earth conductors.
Cord size / current rating
length
0.5mm
2
/(3A) 1.0 mm
2
/(10A) 1.25 mm
2
/(13A)
5m
0.20 0.10 0.10
10m
0.40 0.20 0.20
25m
1.00 0.50 0.40
For further information on protective conductor
resistance and testing of portable appliances can be
found in the Code of Practise for In-service
Inspection and Testing of Electrical Equipment
published by the IEE.
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