I m working on a commercial construction site and i ve been requested by he client to install metal cable ties to all inverted tray runs for my beldon and swa cables.
Metal tie wraps regulations.
Currently there is no product standard to identify appropriate fixings to comply with the wiring regulations.
This will require metal fixings.
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However the iet states.
In july 2018 the 18th edition of the iet wiring regulations bs 7671 was published.
Improve cable management with cost effective cable ties and straps.
Capable of withstanding temperatures of over 500 c stainless steel cable ties and mounts comply with the new regulations and can significantly reduce the risk of loose wiring and melting trunking.
Plastic cable ties and cable trays are not considered appropriate neither is aluminium because of its low melting point.
Suitably spaced steel or copper clips saddles or ties are examples that will meet the requirements of this regulations this means that plastic fixings can be supplemented with metal ones but that electricians and electrical contractors cannot rely exclusively on plastic clips saddles or ties.
I ve looked through bs7671 and i can t seem to find the distance required between each metal cable tie.
Metal clips and cable ties must be used when fixing fp200 firetuf etc to maintain it s integrity in fire unlike pyro which can be clipped with nylon cable ties without a problem if fp falls from it s fixings the cable can fail prematurely in a fire unlike pyro which carries on working.
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The requirement is included in a new regulation regulation 521 11 201 which is reproduced below.
This is why suitable supports should be selected and installed to prevent collapse of the wiring system in the event of a fire.
Does anyone know where.