Consumer Unit Questions

[ta-electrical]

Hi, i've got a few questions regarding consumer unit connections;

My first question: On a split load consumer unit does every circuit need to be protected by RCD e.g. lights ?

Second question: If a high integrity consumer unit has two unprotected circuits next to the main switch, do they have to have RCBO or would MCB protection be sufficient enough to meet the 17th edition wiring regulations?

Third question: A 6mm SWA cable going to a shed to a small consumer unit with RCD - supplying a ring main and lights - will the cable need 32amp RCBO on the main consumer unit in the house or just 32amp MCB protection?

Thanks in advance.

 

[GStueyXR]

Hi, i've got a few questions regarding consumer unit connections;

My first question: On a split load consumer unit does every circuit need to be protected by RCD e.g. lights ?

No, but the will need to be surface mounted cables or buried deeper than 50mm with earthed meatalic capping.

Second question: If a high integrity consumer unit has two unprotected circuits next to the main switch, do they have to have RCBO or would MCB protection be sufficient enough to meet the 17th edition wiring regulations?

As above

Third question: A 6mm SWA cable going to a shed to a small consumer unit with RCD - supplying a ring main and lights - will the cable need 32amp RCBO on the main consumer unit in the house or just 32amp MCB protection?

IMO It would be best to RCBO as all final circuits will then be protected as well as the distribution cable.

Thanks in advance.

see bold

 

[mccant]

circuits in bathrooms will need rcd protection unless bonded to current regs also anything with a socket on it will require rcd as previously stated surface and mechanically protected does not but it is doubtfull that cables burried in walls will be 50mm deep after all coz 5cm is deeper than any plaster theese days.
you would be better off getting a dual rcd board then your covered as rcbos are a bit pricey
the armoured going to the garage would be ok without rcd if you had the sheathing terminated as this counts as mechanical protetion,with an rcd in the garage although i would be inlined to protet ths aswell , some clown will point out you have an rcd supplying an rcd,(in series) but thats not going to bother anything unless a bigger one is fitted in the garage than the house

 

[Amp David]

Since when was 50mm the same as 5cm?

 

[TPES]

You shouldn't have 2 x 30ma RCD's inline,

MCB on the SWA at supply (Non RCD), Then RCD as incomer on shed CU.

This would go on the unprotected way on a high integrity CU in main house as an example.

 

[Amp David]

Agree there sid

 

[TPES]

------------------------------------------------------------------------------------------------------------------------------------------------

MCCANT

I must be that clown!! lol

 

[mccant]

1mm =1mm , 10mm=1cm
; 50mm= 5 cm
come on man this is kids stuff lol

 

[Deleted member 9648]

circuits in bathrooms will need rcd protection unless bonded to current regs

Not correct...To comply with 17th edition all final circuits in a bath/shower room must be RCD protected regardless of whether supplementary bonding is in place or not............supplementary bonding may be omitted providing ....
1. All final circuits are 30ma RCD protected.
2.Required disconnection times are met.
3.A continuity reading of <1667ohms is measured between conductive and extraneous conductive parts within the bath/shower room.

 

[Deleted member 9648]

Since when was 50mm the same as 5cm?

It was when I was at school.

 

[JulianC]

Since when was 50mm the same as 5cm?

Since around 1791, when the French adopted the metric system.

Well, you did ask.

 

[Amp David]

Sorry Mccant, totally messed up there. you re right, what was i thinking, i don't know DOH
I am a richard head lol

 

[GStueyXR]

Since when was 50mm the same as 5cm?

LOL gotta be a wind up

 

[Amp David]

Wish it was, but boy do i feel stupid now

 

[GStueyXR]

Wish it was, but boy do i feel stupid now

That's hilarious.... I bet even though you were behind a computer you still blushed...

Cheers mate, you made me smile

 

[Amp David]

Too right.

I actually feel a bit sick now, just on the fact i posted such tripe.

Happenes to us all at some point, hopefully

 

[tuckermot]

Hi al

question !!!!

DB1 in house ( dual rcd ) feeding small ccu in garage with swa !!! this in turn will feed a swa to a garden shed!!!

Question !!!

i fully under stand 30ma rcd,s in line is a no no !!! so can i install the garage unit with just a main swith and no rcd/main switch and in turn feed the shed via swa from ccu in garage !!!

Question !!!

because of feed from db1 being on a rcd i can not tt the garage ccu so will have to export the earth from db1 . iunderstand you can do this as long as there is no extranios conductive parts in out buildings also i am going to rely on the rcd in db1 ( house ) to protect all the out side installation!!!! i know that if a neutral earth fault occures it will knock half the board out in db1 but can not see any other way round it !!!

Question !!!!

would you guys and girls approach it in the same manner

thanks
Richard

 

[Spudnik]

Too right.

I actually feel a bit sick now, just on the fact i posted such tripe.

Happenes to us all at some point, hopefully

Fantastic.

You are SOOOOOOOOOO not gonna live this down

 

[mccant]

yes your right ,although if doing periodic inspection you found no rcd in bathroom but it was bonded you could get away with a code 4 for it
not that it helps any in this case

 

[GStueyXR]

Amp D please make that quote your footer message

 

[Spudnik]

Amp D please make that quote your footer message

I beat him to it

 

[mccant]

i do it all the time , will argue all day about something then pull out the regs and find i m wrong, normally insult a few people along the way aswell

 

[mccant]

i would put some tale blocks on and fit a seperate 1 way unit in the house for the garage

 

[GStueyXR]

I beat him to it

Quality LOL

 

[GStueyXR]

i do it all the time , will argue all day about something then pull out the regs and find i m wrong, normally insult a few people along the way aswell

Been there

 

[Deano12323]

can i speak to you about commercial consumer units

 

[Deano12323]

i need advise from the 17th as ive been made redundent as surley many of you can relate to ,i just want to no some thing,can any body help ?

 

[Spudnik]

Start a new thread.

You will get more hits that way.

 

[Deano12323]

i would put some tale blocks on and fit a seperate 1 way unit in the house for the garage

Make sue you use an RCD unit with 32 Afor sockets if 1 socket a 16 A MCBO and 6 A for your lights,And always get it certified.So no a 1 way unit ant gud,you got to remember cable size,contaiment and above all saftey.

 

[ezzzekiel]

so just to clarify "how many mm in 5cm?"

sorry had to

 

[GStueyXR]

I giggled my way to sleep last night

 

[Phil]

i missed that 50mm one last night internet was off and on all night don`t worry mate no one will mention it on here

 

[Amp David]

I giggled my way to sleep last night

Good lad, I cried myself to sleep.

At least it cheered everyone up

 

[mogga]

its 5amish iv just got in fea a night shifty n found this thread a lot more enjoyable than the Snippity Snip one i read yesterday moirning Im now off to ask the wife if 5cm=50mm n see her reaction ( she can be a bit blunt as to just how stoopid some ppl r )