Baffled

[ratboymark]

just been asked to do some tests for a friend of mine who has a problem of when ever the electricity is turned off by the REC when the supply returns it trips some of the MCBs ive done all the normal tests that would be carried out for a 17th edition EIC for all of the circuts in the house but not on the supply and carnt see anything wrong all were as expected never encoutered this before any ides of what this could be any thoughts much appreciated thanks

 

[alanl]

I presume many things are plugged in permanently, they all want to start up together when the power comes on, an initial surge to power them all causes the MCBs to trip.
Alan.

 

[ratboymark]

thats sort of what i was thinking its allways nice to hear a second opinion thanks.

 

[High Tower]

Any big inductive loads, bringing them in under load would do it

 

[ratboymark]

The full lower house has fluros in range from 4 foot singles to twin 6 foots that would certainly go with the big inductive load idea and there on a type B this combined with all the things that are all ways plugged in would explain why this is happing thanks for the ideas guys much appreciated!

 

[High Tower]

The full lower house has fluros in range from 4 foot singles to twin 6 foots that would certainly go with the big inductive load idea and there on a type B this combined with all the things that are all ways plugged in would explain why this is happing thanks for the ideas guys much appreciated!

That would do it

 

[ratboymark]

im now thinking i should maby suggest using a type C for down stairs lights

 

[SirKit Breaker]

im now thinking i should maby suggest using a type C for down stairs lights

Not if under normal circumstances they work fine with a type B.