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]

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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