consumer unit

[breezer]

Put it this way, you go to a ford garage, you get ford branded parts. You go to a different garage you get cheaper non-branded parts, but quite possibly made by the same company on the same production line.

dont think so, similar yes same, no

 

[plugwash]

What seems strange to me is how that having all the circuits protected on the cu by a 30ma RCD is no longer deemed acceptable by the regulations, when surly that is safer than having a 100ma RCD protecting all the circuits on a cu.

the wiring regs don't prohibit a 30ma rcd covering everything but i think other things like fire alarm regs do

the idea is that if there is a fault on one of the cuircuits protected by the 30ma rcd it will trip first before the 100ma time delay unit

why was it installed like this in the first place? what is so unsafe about a tt supply that all the cu needs RCD protection?. Unlike modern supplys in new homes?.

TT supplies have a high earth loop impedence which means that not enough current will flow for overcurrent protection devices to disconnect a short to earth

this is why they need some form of rcd protection on everything

 

[Damocles]

Actually, yes. Been quite a few cases where the same parts sub-contractor sells the same thing under an own-brand label. That is the whole point of own brands. Some of these companies are quite proud of their reputation.

That is not to say that there are no rip-off merchants out there happy to sell you brake pads made out of putty.

 

[ban-all-sheds]

why was it installed like this in the first place?

Time moves on, knowledge changes, safety standards increase..

what is so unsafe about a tt supply that all the cu needs RCD protection?. Unlike modern supplys in new homes?.

As plugwash said TT supplies have a high earth loop impedence which means that not enough current will flow for overcurrent protection devices to disconnect a short to earth. See here //www.diynot.com/forums/viewtopic.php?p=76467#76467 for a discussion of disconnection times.