Smoke Alarm

[batty]

Wouldn't they just remove the back-up battery?

Only if they where stupid don't they see the adverts on the TV.

 

[Apache]

It is however , a very, grey area. Perhaps they should be fed via a locked , 1way unit next to the CU or built into the CU ?

Wouldn't work. If they are on any sort of trip it must be resettable and also there may be a legitimate reason for the householder to isolate.

 

[Apache]

Only if they where stupid don't they see the adverts on the TV.

I've done it when the battery ones bleep at night and you han't a spare 9V square battery (what else does anyone use them for?).

Got a new battery next day tho

 

[SPECIAL LOCATION]

You make a good point Specs. But I can't help thinking if the dedicated MCB were switched off, the householder would probably never know. The light circuit being off would be a nusance and more likely to be restored.It is however , a very, grey area. Perhaps they should be fed via a locked , 1way unit next to the CU or built into the CU ?

Should they not be recommended to push the test button on a regular basis?

will not the regular burnt toast or sausage & bacon frying give a nice little trigger test?

why would they switch an MCB off?

I always tell my customers that ALL switches on their new CU should be "UP"!

Even if fed off a light circuit.. the smokes STILL NEED A FCU or similar to allow isolation of the alarms without affecting the lighting!

this could also be left off IMHO? ?:|

 

[NozSpark]

Why do you care what people do with their smoke alarm cct's? Our responsibility lies in the correct installation of the circuits (end of), not what happens to them afterwards.

 

[a1]

If you are going to a job just to add smokes and client doesn't want this that and the other done, then Yes - Add them to the lighting circuuit.

But - if the client is having a full re-wire, then they should be on their dedicated cct.

 

[kme]

Further to this discussion:

I took my NIC inspector out to a bungalow - TT - full rewire. Alarms on seperate cct, cables not in walls at all.

I`d fitted a board with main switch, and RCBo`s for all ccts, except smokes. I put those on a 6A MCB, thinking that the alarms were DI, and the risk of the RCBo tripping out for a dedicated cct was unwarranted.

WRONG!

They want it on a RCBo, so thats what I`ll be doing.

100 x "I`m a silly fart!"

 

[steptoe]

Further to this discussion:I took my NIC inspector out to a bungalow - TT - full rewire. Alarms on seperate cct, cables not in walls at all.

I`d fitted a board with main switch, and RCBo`s for all ccts, except smokes. I put those on a 6A MCB, thinking that the alarms were DI, and the risk of the RCBo tripping out for a dedicated cct was unwarranted.

WRONG!

They want it on a RCBo, so thats what I`ll be doing.

100 x "I`m a silly fart!"

I think you answered that yourself.......

 

[NozSpark]

Further to this discussion:I took my NIC inspector out to a bungalow - TT - full rewire. Alarms on seperate cct, cables not in walls at all.

I`d fitted a board with main switch, and RCBo`s for all ccts, except smokes. I put those on a 6A MCB, thinking that the alarms were DI, and the risk of the RCBo tripping out for a dedicated cct was unwarranted.

WRONG!

They want it on a RCBo, so thats what I`ll be doing.

100 x "I`m a silly fart!"

The reason he wanted a RCBO was because it is a TT installation (all circuits must be RCD protected in a TT install) now if it were TNS or TNC-S then you don't so long as pyro,swa, surface clipped.

P.S. are you allowed to use single pole RCBO's in a TT install????

 

[batty]

The reason he wanted a RCBO was because it is a TT installation (all circuits must be RCD protected in a TT install) now if it were TNS or TNC-S then you don't so long as pyro,swa, surface clipped.P.S. are you allowed to use single pole RCBO's in a TT install????

Not on caravan parks and marinas I think and a few others.

Batty

 

[kme]

The reason he wanted a RCBO was because it is a TT installation (all circuits must be RCD protected in a TT install) now if it were TNS or TNC-S then you don't so long as pyro,swa, surface clipped.P.S. are you allowed to use single pole RCBO's in a TT install????[/quote]

Yes, is the simple answer to that one

 

[batty]

The reason he wanted a RCBO was because it is a TT installation (all circuits must be RCD protected in a TT install) now if it were TNS or TNC-S then you don't so long as pyro,swa, surface clipped.P.S. are you allowed to use single pole RCBO's in a TT install????[/quote]

Yes, is the simple answer to that one

Martyn

Not all TT installs can have single pole RCBO'S. Caravan parks require double pole RCBO'S and their are others I will look it up in the regs.

Batty

 

[Gel]

Best on dedicated circuit as less chance of EMI from other devices on circuit ie d/light transformers/ soem CFL's, dimmers.

Also 17th edition requires Safety Services to be on dedicated circuit, and I recall ability to be isolated independenly.

 

[Andy™]

Also 17th edition requires Safety Services to be on dedicated circuit, and I recall ability to be isolated independenly.

id still put smoke on with a lighting circuit. people tend to notice fairly quickly when their lights dont work!

 

[Gel]

Problem is that it's known fact that EMI interference travels down the interconnect line from alarm to alarm.

No name CFL's, L/V Transformers, dimmers are known culprits re generating

this interference.

BT have reported some instances of bad interference knocking broadband signal over , travelling down the bell wire.

 

[Andy™]

now i know CFLs etc can cause interference etc... but i fail to see what difference it would make if the smoke was wired to the same breaker or its own breaker next to it... unless the circuit is turned off, its still all connected by a bit copper