2391 exam question about s/o's

[john h owen]

A continuity test between P & N is conducted on a final ring main comprising of 2,5/1.5mm pvc/pvc cable. Readings of two sockets close to each other indicate a increasd value to that of the other sockets. State
1)TWO possible reasons for the increased redings.

 

[Sintra]

One of the sockets is a spur of the ring.

High resistance termination at one of the points.

 

[martysparky]

A possible bridge

 

[SimpleSimon]

Reduced conductor size. (stupid but still a reason.)

 

[nickblake]

Faulty socket always a possibility , but one id say a spur

 

[john h owen]

Faulty socket always a possibility , but one id say a spur

yes I was thinking the same bad connection L and N and and the presence of a spur but I'm not really sure.

 

[SimpleSimon]

An insulation resistance test was carried out on a large complex installation before it wasput into service. The test values obtained between live conductors and earth was 10Mohms. State
A) two possible reasons for this value excluding connect equipment and cable damage.
B) whether measured value is acceptable