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OSG 7.3.2 cables in walls and partitions

In the above,item d states the cables can be protected by earthed steel conduit or,

Item e then states :mechanical protection sufficient to prevent penetration of nails,etc,

but no mention of earthing..

I have a situation with a short 200mm horizontal run outside the zones.

I could slide a lenght of earthed conduit over,but then the earth connection would be plastered

over and could not be inspected.

If I treat the conduit as mechanical protection,it would not need earthing?

Wondered what others would do.

Regards,Hz

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0 AJJewsbury over 4 years ago

For example, from Eland:

Protective devices used for these cables shall be either Type B to BS EN 60898 or Type B RCBO to BS EN 61009-1. The protective devices shall have a maximum let through energy (l2t) of 42000A2s when used with 1.0mm2 or 1.5mm2 cable and 60000 A2s when used with 2.5mm2 or 4.0mm2 cable.

Whereas the k²S² for a 1mm² c.p.c. (as in 1.0mm² and 1.5mm² T&E) would be just 13,225A²s and a a 1.5mm² c.p.c. (as in 2.5mm² and 4mm² T&E) would be just 29,756.25A²s.

- Andy.
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0 AJJewsbury over 4 years ago

For example, from Eland:

Protective devices used for these cables shall be either Type B to BS EN 60898 or Type B RCBO to BS EN 61009-1. The protective devices shall have a maximum let through energy (l2t) of 42000A2s when used with 1.0mm2 or 1.5mm2 cable and 60000 A2s when used with 2.5mm2 or 4.0mm2 cable.

Whereas the k²S² for a 1mm² c.p.c. (as in 1.0mm² and 1.5mm² T&E) would be just 13,225A²s and a a 1.5mm² c.p.c. (as in 2.5mm² and 4mm² T&E) would be just 29,756.25A²s.

- Andy.
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OSG 7.3.2 cables in walls and partitions

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