R1+R2 on 2 core Hi Tuff

What is the conduit made of?

Good question. If it's earthed steel then it's acting as a c.p.c. and so you can test R2 or R1+R2 at the far end as normal. But then there's the risk of having two different earthing systems within reach of each other at the garage end.


If it's plastic it might or might not comply with 522.8.10 - all depending if it gives equivalent mechanical protection - which rather depends on the circumstances - where it's buried and what other mechanical protection/risks are present.


The lack of a c,p,c, on the distribution circuit sort of feels it should fall foul of 412.1.2 and 412.2.3.2 as it's in effect a circuit that relies on shock protection by double or reinforced insulation rather than ADS in an uncontrolled environment - but I think it just scrapes though as the equipment being fed isn't class II and a c.p.c is provided at the far end (if from a different earthing system).


   - Andy.

What is the conduit made of?

Good question. If it's earthed steel then it's acting as a c.p.c. and so you can test R2 or R1+R2 at the far end as normal. But then there's the risk of having two different earthing systems within reach of each other at the garage end.


If it's plastic it might or might not comply with 522.8.10 - all depending if it gives equivalent mechanical protection - which rather depends on the circumstances - where it's buried and what other mechanical protection/risks are present.


The lack of a c,p,c, on the distribution circuit sort of feels it should fall foul of 412.1.2 and 412.2.3.2 as it's in effect a circuit that relies on shock protection by double or reinforced insulation rather than ADS in an uncontrolled environment - but I think it just scrapes though as the equipment being fed isn't class II and a c.p.c is provided at the far end (if from a different earthing system).


   - Andy.