8
PDL Series
Loop Test
The 3 Socket Test LED’s will flash ORANGE to indicate a (no-trip)
Loop Measurement Test is being made and unlike other no-trip Loop
Testers the result will be given in a few secconds - if you wish the test
can be repeated to check the result.
For Guidance Only - Refer to the IEE Wiring Standards BS 7671.
1 of 5 LED’s will illuminate to display the Loop Test result.
Less than 1 Ohm.
< 1
A good result and typical of a correctly wired TN (PME) system.
Less than 2 Ohms.
< 2
A result that would be worth pushing the plug in and out a
few times to seee if it is just tarnished socket contacts or checking
where the socket is located - if it is the furthest point from the
distribution board you may expect it to be a higher reading.
Less than 100 Ohms.
< 100 Now you must check the wiring system being used - if it is a TT
system (earth rod) then it is a good result but if it is any other system
this result should cause concern and urgent investigation is required.
Less than 200 Ohms.
< 200 The same as above, but assuming it is a TT supply system most
codes of practice accept a Loop Test value of less than 200 Ohms
for an earth rod for a system protected by a 30mA RCD as being
acceptable
Greater than 200 Ohms.
> 200 There are very real problems with this system and urgent further
investigation is required.
