Where, if anywhere, in the Wiring Regulations or its Guidance Notes does it say that isolators have to have 3 mm contact separation when open?
I have heard this so many times, but cannot find where the requirement is stipulated.
Andy Betteridge
It appears in the 1995 version of BS 1363-4 {Clause 8.1.5} (13A plugs, socket-outlets etc) but I don't know if it is still in the current version. It may well appear in other related standards - but contact separation requirements will be voltage dependant so the there might just be a dielectric strength test instead of a specified gap.
Where, if anywhere, in the Wiring Regulations or its Guidance Notes does it say that isolators have to have 3 mm contact separation when open?
I have heard this so many times, but cannot find where the requirement is stipulated.
Andy Betteridge
It appears in the 1995 version of BS 1363-4 {Clause 8.1.5} (13A plugs, socket-outlets etc) but I don't know if it is still in the current version. It may well appear in other related standards - but contact separation requirements will be voltage dependant so the there might just be a dielectric strength test instead of a specified gap.
