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OSG Ref B installation limits

WireWeHere

Table 7.1(ii) of the OSG includes Installation type B* which is "Enclosed in conduit or trunking on a wall, etc." This isn't included in any of the allowed installation methods of Table 7.1(i).

What "installation method" classification do you use when installing T&E on a blockwork wall in oval conduit, in a chase for subsequent plastering over? Equally, when the wires are just chased in and plastered over, or do you just consider that type C "clipped direct"?

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  • 0

    Referring to BS 7671, sheathed cables in conduit embedded in masonry is method 60, which maps to reference method B.

    Sheathed cable under capping in the same situation would be method 58 and reference method C, as would a plain cable without any added mechanical protection.

       - Andy.

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  • 0

    Referring to BS 7671, sheathed cables in conduit embedded in masonry is method 60, which maps to reference method B.

    Sheathed cable under capping in the same situation would be method 58 and reference method C, as would a plain cable without any added mechanical protection.

       - Andy.

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  • 0 in reply to AJJewsbury

    Thanks Andy, good confrmation that, as expected, plain cable in chase and plaster is Ref C. But it doesn't explain why B isn't in table 7.1(i).

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