fan in bathroom

[dayrider3883]

I have installed a fan from the lighting switch to bathroom do i need to use a spur for the fan or can i go direct

 

[ezzzekiel]

rcd protection required and a lot of these fans require fusing down at 3a (per manu instructions) an isolator is required for maintenance (ignoring the if there is a window debate)

 

[dayrider3883]

But if it is a delayed fan where 2 live are used perminent and switch wire which one is fused down

 

[Amp David]

Usually show the live feed is fused.

I always chuckle to myself when the old window in the bathroom is mentioned.

I always think to myself what happens when you go to look at that faulty fan mid December at half 3 and its almost dark outside, not much light in the bathroom then but you can isolate the fan if there isn't an isolator

 

[telectrix]

But if it is a delayed fan where 2 live are used perminent and switch wire which one is fused down

both. this means fusing down before the light.

 

[Octopus]

If the property hasn't got RCD protection, take the loop (before the light) into a FCU RCD, then out to the light, fan, etc. This way you can fuse down and have it all RCD protected. Nice and easy.

I think the regs should make an isolation switch for the fan mandatory!

 

[Deleted member 26818]

If the property hasn't got RCD protection, take the loop (before the light) into a FCU RCD, then out to the light, fan, etc. This way you can fuse down and have it all RCD protected. Nice and easy.

I think the regs should make an isolation switch for the fan mandatory!

Wouldn't comply with BS7671, as the whole circuit requires RCD protection, not just the part that enters the Bathroom.

 

[Octopus]

Wouldn't comply with BS7671, as the whole circuit requires RCD protection, not just the part that enters the Bathroom.

Really. Live and learn, so in the case of a spur from a ring why can we get away with a RCD FCU then sockets. At least I've been adding RCD protection and isolation switching - unlike MANY I see around here!

 

[dayrider3883]

but if you use the bathroom light switch to trigger the fan and the lighting is rcd protected and the fan is wired in 1.5 same as lighting then the lighting mcb should protect the fan wiring the fuseboard is next to the bathroom

 

[Octopus]

but if you use the bathroom light switch to trigger the fan and the lighting is rcd protected and the fan is wired in 1.5 same as lighting then the lighting mcb should protect the fan wiring the fuseboard is next to the bathroom

You lost me!

 

[telectrix]

the lighting circuit is protected with a 6A MCB ( usually ) so if the manufacturers instructions state a 3A fuse, then that has to be incorporated, usually by means of a FCU ( RCD if necessary )

 

[dayrider3883]

fan comes on with bathroom light , light is rcd and mcb protected both light and fan are wired in 1.5 i have took a perminent live and lighting switch wire to fan

 

[Deleted member 26818]

Really. Live and learn, so in the case of a spur from a ring why can we get away with a RCD FCU then sockets. At least I've been adding RCD protection and isolation switching - unlike MANY I see around here!

Yes it's a common misconception, although I believe that it's deliberate attempt to circumvent the Regulations, as using an RCD FCU is often a lot easier than providing RCD protection for the whole circuit.
701.411.3.3 Requires: "Aditional protection shall be provided for all circuits of the location, by the use of one or more RCDs having the characteristics specified in Regulation 415.1.1."
Which translated means all circuits supplying a location containing a bath or shower shall have 30mA RCD protection.
They've re-worded the Regulation in the amendment to only refer to LV circuits. We were hoping that this re-wording would have allowed the use of SELV equipment without the supply circuit having to be RCD protected, if the source of SELV was outside of the location. Unfortunately such is not the case. RCD protection is still required for the LV part of a SELV circuit, even though it will be as much use as a chocolate tea pot.

 

[timo1]

Really. Live and learn, so in the case of a spur from a ring why can we get away with a RCD FCU then sockets. At least I've been adding RCD protection and isolation switching - unlike MANY I see around here!

Good point, I thought you just had to make additions on older installations comply such as RCD sockets etc..and you were not obliged to upgrade the whole circuit?

 

[telectrix]

but. if tthe instructions stipulate a 3A fuse and you have not fitted such, if the fan, being a load of crap, made in china, catches fire asnd burns the house down, it's you that will be in the dock, not fu manchu who made the crap in the first place.