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I didn't understand, what you mean by 'don't be surprised when he leaves early' ?

Thanks.  Electrician will come on Tuesday as he is very busy.

TT system, RCD 100mA.  I contacted electricity supply company to check earthing, and an engineer came to house, and fitted PME Earth terminal near to consumer unit.  He connected the PME to fuse, but NOT connected to consumer unit.  He advised me to first make sure that everything is...

Will external box sound even if there is no battery OR battery is dead? As I mentioned earlier, external box doesn't make any sound when power goes away.  It only starts sound when power is back.

If the inside panel battery is dead, does it still need to be disconnected?  I think there is no battery in bellbox or battery is already dead, as there is no sound whenb power goes away.  Sound only starts when power comes back.

I am asking because I recently bought this house, and wondering if there is any need to upgrade the consumer unit. 

In my terraced house, when there is electricity power failure, there is NO noise from alarm. But when electricity power comes back, then alarm starts beeping.  I don't want to use burglar alarm at all, so I don't want to replace battery for inside panel.  I am concerned that if I am away from...

I read somewhere on internet that some  types of MCB can turn on itself after tripping.   I don't want to use burglar alarm in my house.  On consumer unit, MCB is type 2.  If I manually turn off  (pull down) the MCB for burglar alarm, will it stay turned off, and not turn on again itself?     

My house has RCD model LN6180 (pic attached). Rated Tripping Current is 100mA. Is it good enough? Rated Breaking Capacity is 2000A. What does it mean? Is this good enough? If I test RCD by pressing button T, will it trip the main RCD switch OR the individual 5 separate switches on RCD? What...