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.
Metal tie wraps regulations.
However the iet states.
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.
Bs 7671 2011 a3 2015 iet wiring regulations seventeenth edition which was published in january 2015 and comes into effect on 1 july will include a requirement that wiring systems in escape routes shall have fire resisting supports.
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.
In july 2018 the 18th edition of the iet wiring regulations bs 7671 was published.
Does anyone know where.
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The requirement is included in a new regulation regulation 521 11 201 which is reproduced below.
Keadic 30pcs 8 inches 304 stainless steel zip ties exhaust wrap coated locking metal cable zip ties for computer wire harness automotive parts and more 4 5 out of 5 stars 205 8 99 8.
Currently there is no product standard to identify appropriate fixings to comply with the wiring regulations.
Improve cable management with cost effective cable ties and straps.
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.
I ve looked through bs7671 and i can t seem to find the distance required between each metal cable tie.
While it does not come into force until january 2019 there is already plenty of speculation as to what exactly the new regulations mean leading to many varied and confusing interpretations about supporting wiring systems.