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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

    I think that I see the problem here, which is the use of the phrase, "Allowed installation methods".

    Remember that OSG is only a guide and in many ways table 7.1(i) is a ready-reckoner.

    I don't think for one moment think that it means that other installation methods are prohibited: it is simply that if you want to know the maximum length of a circuit, columns 5 to 8 work only for the installation methods given in column 4.

  • 0 in reply to Chris Pearson

    Completely agree, but what maximum lengths do people use in the case of T&E in oval conduit and plaster on a blockwork wall? As this is a pretty common scenario I am surprised it isn't covered by the information. Surely allowed as it is so common and 'makes sense'.

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  • 0 in reply to Chris Pearson

    Completely agree, but what maximum lengths do people use in the case of T&E in oval conduit and plaster on a blockwork wall? As this is a pretty common scenario I am surprised it isn't covered by the information. Surely allowed as it is so common and 'makes sense'.

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