My last 'non Amd 3' CU Install.

Dave OCD · Dec 21, 2015

Put this in today, I hope it doesn't burst into flames.:tongue3: Didn't have the time to faff about and get the cabling 'perfect' as I had so much to do today but I think it's ok. With the BG boards I generally 're number' the earth bar as to me it's illogical having the CPCs running in the opposite order of the neutrals,I'll miss the insulated CUs. Sorry about the
poor photo.

[ElectriciansForums.net] My last 'non Amd 3' CU Install.

Englishman · Dec 27, 2015

Leesparkykent said:
Board upgrades don't look as good unless the conductors or long enough. IMO when doing upgrades id rather have the board look a little untidy than add an unnecessary connection/point of failure just to dress the cables that little bit more neater.

I only ever extend cables if they won't physically fit into the terminals on the new board, other than that, I just work with what I have and do the tidiest job I can, it's just not easy with old cables that have little slack. I'll be the first to put a couple of mine up. And welcome criticism!

The middle one was slightly tidied up where the rcd neutral feed is poking out before it was all closed up.

Darkwood · Dec 27, 2015

@englishman - I have edited and altered your last pic' when you see why I think you will understand we cannot show that on the forum

Midwest · Dec 27, 2015

telectrix said:
the 100mA S type is to provide fault protection where the Ze is too high (as with a TT installation) to cause operation of OCPD within specified times. it is not there to protect against direct contact with live parts. this id down to the 30mA devices installed for the finals.

But as in Dave OCD install #40, the 100ma would be superfluous?

Guest77 · Dec 27, 2015

Englishman said:
. I'll be the first to put a couple of mine up. And welcome criticism!

Seriously I respect the fact your man enough to stick some up, but I can see at least 5 errors across the 3 pictures and I haven't even started looking properly yet. I await others input with glee.

Midwest · Dec 27, 2015

MDJ said:
Seriously I respect the fact your man enough to stick some up, but I can see at least 5 errors across the 3 pictures and I haven't even started looking properly yet. I await others input with glee.

Wallpaper border behind the CU?

Simonslimline · Dec 27, 2015

Never seen a board mounted on water pipes before.

HandySparks · Dec 27, 2015

MDJ said:
... but I can see at least 5 errors across the 3 pictures....

Go on then, list them. Don't be shy.

davesparks · Dec 27, 2015

MDJ said:
Seriously I respect the fact your man enough to stick some up, but I can see at least 5 errors across the 3 pictures and I haven't even started looking properly yet. I await others input with glee.

I must be slipping, I can only get three at first glance

shanky887614 · Dec 27, 2015

deleted

Midwest · Dec 27, 2015

davesparks said:
I must be slipping, I can only get three at first glance

Well we sussed out the wallpaper border and fixing it to the water pipes, what's the third?

davesparks · Dec 27, 2015

Midwest said:
Well we sussed out the wallpaper border and fixing it to the water pipes, what's the third?

Them little switches is all turned off, the kettle will never boil for tea!

Simonslimline · Dec 27, 2015

What are peoples opinions with regards to the arrangement of the MCB's?

I was taught at college to start with the highest In and work down from there. Making this as equal as possible on both RCD's.

I have also been told that it is better practice to have the bigger loads spaced out from each other because of possible heat etc. This would not be the case so much in a domestic setting though i think, maybe more applicable in industrial environments.

Any advice or opinions on this are appreciated.

Darkwood · Dec 27, 2015

Balance big loads over the 2 rcd's, the order isn't really an issue in domestic but in commercial and industrial then derating factors need to be accounted for, for heavy loading and mcb grouping.
Domestic I would have up sockets and d/s lights on one rcd then down sockets and u/s lights on the other so if a lighting circuit trips the rcd you can plug lamps in the wall sockets if it won't reset.

Simonslimline · Dec 27, 2015

darkwood said:
Balance big loads over the 2 rcd's, the order isn't really an issue in domestic but in commercial and industrial then derating factors need to be accounted for, for heavy loading and mcb grouping.
Domestic I would have up sockets and d/s lights on one rcd then down sockets and u/s lights on the other so if a lighting circuit trips the rcd you can plug lamps in the wall sockets if it won't reset.

Ok thanks fore the response. I guess my tutor just had his opinion regarding this then.

Darkwood · Dec 27, 2015

Simonslimline said:
Ok thanks fore the response. I guess my tutor just had his opinion regarding this then.

Its common practice to load the heavy breakers first then the lightest loads last, I have not in my years been given a logical reason as to why and yes! I was also taught that way in the 80's. I wouldn't worry about order too much in domestic but like I said when stepping into other types of industry with heavier switchgear and loads then this advice becomes misleading and can cause premature tripping, overheating etc etc. I would be interested if your tutor can give a valid reason, putting a heavy load on the end will not reduce the momentary voltsdrop as the load is energised - if you suffer the lights flicking when you switch the kettle on etc then changing the mcb order will not reduce it as its a VD on the supply itself as it adjusts to the new load.