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Certification Manual

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Joists

Similar rules apply to drilling and notching Joists. Alliance very rarely

encounters this problem as we run our wires above the ceiling joists and

under floor joists, not through them. You should avoid drilling or

notching joists if at all possible. However, should you encounter such

an occurrence, keep all holes centered vertically in the joist. Don't allow a

hole to be drilled within 2" of the top or bottom of the joist. The extreme

ends and the middle third of the joist’s span joist carry the load, so avoid

making holes there if possible. You are limited to a hole that is a fifth of the

measured depth of the joist. A 2" x 6" joist actually measures 5-1/2" deep,

so you can drill a 1" hole max, but go smaller if you can. You can drill

multiple holes rather than one very large hole when many wires need to go

one way. Remember, drilling through joists is a last resort measure, and

never drill through any part of a 2x4 truss roof!

Steel Studs

When a facility uses steel studs, there is usually no need to drill in

them as they are manufactured with holes for wire runs in them. Care must

be taken in running wire through these holes as they are often sharp. It is

best to avoid running wire through studs as it increases the possibility of

having a short. It is worth the extra wire to go up the wall cavity, across the

ceiling space and then back down into the destination wall cavity.

Aesthetics

Whether new construction or existing, the preferred installation

procedure is to conceal all wires and use flush mounted components. If

this is not possible, then external chases can be used, but for the

aesthetics sake, Alliance prefers to conceal as much as possible. If wire

mold or panduit needs to be used, then first check with the Alliance Project

Manager and also the Administrator to see if they have a preference how it

should look. When using external wire chases such as Panduit or

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WaveWare Apollo T-2000 Informazioni Techniche Pagina 23