Smoke alarms on an CU with 30ma main sw

[Norv]

I've got a situation where I am fitting some extra sockets in a tiny cottage. The CU (manufacturer - Steeple) main sw is a 30ma RCD with 3 mcb's (sockets, Cooker & lights). The customer now wants electric smoke alarms but I cant just fit another MCB cause the main sw is a 30ma RCD.

Would you suggest I change the RCD to, say a 80A switch & then replace the sockets MCB for a RCBO & fit a 6A CB for the smokes

Or any other comments ?

 

[RF Lighting]

What's the earthing supply type?

 

[Spark123]

What's the reason for a 30mA RCD main switch, not a TT supply?

 

[Norv]

Its a TN-S. Got a (labelled) 100A main fuse. Re-wire was done about 8 yrs ago. No main bonding.

 

[Spark123]

What you suggest sounds fine, a 100A main switch might be better.

 

[Norv]

ok thanks for that . Need to find someone that sells Steeple stuff now. Also doing a job which requires GET MCBS. I think Denmans sell those makes.

 

[Spark123]

Isn't Steeple a re-branded GE MCB? Same as Rexel Senates own brand Sector GE?

 

[ricicle]

Steeple was/is a Denmans brand.

 

[Spark123]

I think CPC do GET MCBs if you're stuck for them.

 

[Lectrician]

Or for the price of a 4 way board with 100amp incommer......




Good on you for making sure the smokes are not on the RCD though - Some sparks would not have bothered.