new shower

[electric will]

The graphs in the bgb for the amount of current vs time for fuses and breakers to disconnect is the same as the graphs in the brb, and I bet the haven't changed in the earlier editions of the regs, although some fuses have been took out and other mcb's been added. Back to the old bs3036 fuse wire say rated at 30 amps when too much current flows though it, the wire takes time to heat up and Melt causing disconnection. Mcb's work in the same way, electrics like heat, it takes time to heat something up and melt it

 

[Geordie Spark]

oh dear should i be tarred and feathered lol Why the hell should i fork out for forkin £65.00+ when i can look at amendments.It beggars belief on here when some people nit pick!!!!!! this game is expensive enough changing books so quickly with amendments.To some degree its a money generating exercise

My thoughts too. Cheers mate!! :17:

 

[HandySparks]

How many pages on the BGB are different from the BRB ?and why cannot i read updated ammendments from whatever source?

Because the IET isn't going to publish amendment sheets for 17th Edn Amdt 1. There are changes to too many pages (although many are just the odd word here and there).

 

[electric will]

h,mmmm the little green book---
hi will , what about using a wire fuse like we used to to? or even a cartidge fuse? at least the blow nearer the over current, it seems to me that these so called "trips" are no good
if it says 32a/ or what ever ,thats when it should disconnect, not 46a ffs

So whats the need for, type b,c and d breakers? Are you saying every over current protective device should disconnect at exactly the rated current?

 

[ayjay]

well somewhere near it,will-p
wire fuses do
cartridge fuses do it better, whats the point of an mcb that doesn,t trip at just above its rated current?
a 32a mcb that will stay in at 48a for a certain time! the 4-0 mm,twe cable will be overloaded
perhaps i,m wrong, but all i can say is, if a breaker has 32a written on it, it should trip at say 33a,