Dual RCD board

[VanSolo]

Is this one of those new dual rcd boards?
View media item 8405 View media item 8406

 

[securespark]

NO!!!

It looks like a Dual tarrif board or similar with effectively, two incomer RCD units feeding two busbars.

Danger is, as the busbar cover implies, the two feeds are on two different phases, so between the two lives you have 400V.

(Someone not quite understanding electricity has added up 240+240 to get the 480V they have written on...)

This is an ambiguous and dangerous set-up.

 

[RF Lighting]

Didn't TP used to be distributed at 480V back in the red white and blue days?

 

[VanSolo]

Picked this one up doing a periodic. One of the worst pieces of installation I have ever seen. Worst of it is, it passed a PIR 5 years ago!

 

[RF Lighting]

I'm guessing this is in a commercial premisis as there are two phases present.

Can't even blame this one on sloppy DIY.

Beats most of my Picture of the week!™ photos

OOI, what code did you give it?

 

[ricicle]

Which regulation is it not complying with ?

 

[securespark]

Didn't TP used to be distributed at 480V back in the red white and blue days?

Possibly, he says, frantically thumbing his 14th Ed......

Hmm.

Can only find the following:

ELV: Not exeeding 50V between conductors and 30V ac or 50V dc between conductor & earth.

LV: Exceeding ELV but not exceeding 250V.

MV: 250-650V

HV: 650V+

Can't seem to find a specific mention of TP voltage.

 

[matt1e]

Didn't TP used to be distributed at 480V back in the red white and blue days?

415 when I was a boy

the left hand RCD shouldn't be in there it doesnt fit properly and the snapped off busbar looks as if it's about to cut into the neutrals

 

[securespark]

And how many conductors are attached to the breakers?

 

[ricicle]

Which regulation is it not complying with ?

 

[securespark]

VAN -

I'm assuming you checked and the incomers are on different phases??

 

[VanSolo]

Four ring final circuits split across two RCDs on two seperate phases. The neutrals for the two ring finals on the left hand side are jammed into the load side neutral terminal on the RCD.
Code 2 but was rectified immediately.

 

[securespark]

Shall we put Ricicle out of his misery?

 

[RF Lighting]

I'll go first

134.1.1

 

[ricicle]

I was refering to the two phase set-up