Spot The Problem

[Iggifer]

Super easy one for you.

And the white stuff you can see beneath the busbar shield is a piece of 20mm conduit some BG engineer had deemed necessary to maintain the IP rating of the board - he'd gunked all the top up with caulk, clearly run out for the bottom, and the FCU he'd installed got a liberal helping

Untitled

• Iggifer
• 23 Nov 2013
• 1

 

[undistilled]

Bit difficult to see but the neutrals to RCDs seem odd. I would have preferred the busbar shield to be removed to see exactly what is happening down there.

 

[Iggifer]

The neutrals and rcd circuits all add up and under the busbar shield is all cool. More obvious than that

 

[bernardgreen]

That 3rd RCD ( the one in the middle with the white lever ) seems to be wired in a strange way.

 

[EFLImpudence]

It looks like (but the picture is poor so may not) the N tail in N1 goes to the RCD (I don't mean the RCBO).

 

[JohnW2]

That 3rd RCD ( the one in the middle with the white lever ) seems to be wired in a strange way.

I had presumed that the one with the white lever (and a black one) is a DP RCBO. I'm not sure what you mean by '3rd' - since all I see is one RCD and one RCBO. As others have said, I'm not sure that we can see enough of the wiring of the RCD/RCBO to really be sure what's going on - but some of it does look a little odd.

Kind Regards, John

 

[AndyPRK]

Like the cu in my house.

The rcbo has thick and thin wires coming out of it which is odd.

 

[undistilled]

Unsheathed cables coming down wall and entering CU?

 

[radioredcat]

Hmm Red and Black cables coming out of the top of the board presumably T@E with no Grey insulation.

Edit: Bah should have refreshed the page before posting.

Andy

 

[mfarrow]

Cover missing.

It appears that circuit 1 has no earth.

The RCBO N supply cable is smaller than one of the load cables, but RCBO rating looks in single figures, so should be OK.

 

[sparkwright]

Have two seperate circuits been put onto that two module RCBO?

 

[JohnW2]

Cover missing.

It appears that circuit 1 has no earth.

It does look as if that's probably the case - and that could well be related to the circuit which appears to come down the wall in unsheathed (presumably single-insulated) singles.

Kind Regards, John

 

[JohnW2]

Have two seperate circuits been put onto that two module RCBO?

Seemingly, but that doesn't necessarily represent a problem (although the very differing cable sizes makes one wonder!) - although BS7671 would, of course, define it as one (not two) circuits, because there is only one OPD!

Kind Regards, John

 

[mfarrow]

It does look as if that's probably the case

By the single digit rating, I'm guessing lighting circuit, and the RCBO is there to "compensate" (in the installers eyes) for the lack of said earthing. The board age being pre-17th, I'd say.

 

[sparkwright]

The wiring looks like it could be over 45 years, looking at those buckle clips - so that could explain no earth in a lighting circuit.

The wires look different sizes at the RCBO, yet on closer inspection it looks like perhaps one wire has been sleeved with heatshrink or sleeving.