S.W.A. Armour Earthing.

gkenyon:

Zoomup:

Indeed, I noted the "deficiency" and am not entirely happy with the situation. It was installed on the cheap by a sports' club member. I was keen to learn of regulations that apply if I have to defend my position of criticising the installation.


Z.

As previous post - page 39 of GN3

With respect, that's not the point. Z was looking for a reference in BS7671 2018 itself. To invoke 411.3.1.1 one would need to accept that the armour is an exposed conductive part and the definition of exposed conductive part in part 2 would not support that determination. 

To avoid imagination stretch the normal practice would be to employ explicitness, which is clearly absent in BS7671 with respect to the issue of earthing the armour, other than for certain underground applications. 

Interestingly, in 522.8.10 of IS10101:2020 there is no explicit mention for the need to have the wire armour earthed in underground applications. However, 526.5.1 states "Adequate electrical conductance shall be provided between metal sheaths or armouring of cables and the earthing terminals of equipment. This requires proper design and a proprietary method"........."A cable gland is a proprietary method"

gkenyon:

Zoomup:

Indeed, I noted the "deficiency" and am not entirely happy with the situation. It was installed on the cheap by a sports' club member. I was keen to learn of regulations that apply if I have to defend my position of criticising the installation.


Z.

As previous post - page 39 of GN3

With respect, that's not the point. Z was looking for a reference in BS7671 2018 itself. To invoke 411.3.1.1 one would need to accept that the armour is an exposed conductive part and the definition of exposed conductive part in part 2 would not support that determination. 

To avoid imagination stretch the normal practice would be to employ explicitness, which is clearly absent in BS7671 with respect to the issue of earthing the armour, other than for certain underground applications. 

Interestingly, in 522.8.10 of IS10101:2020 there is no explicit mention for the need to have the wire armour earthed in underground applications. However, 526.5.1 states "Adequate electrical conductance shall be provided between metal sheaths or armouring of cables and the earthing terminals of equipment. This requires proper design and a proprietary method"........."A cable gland is a proprietary method"