UK Can anyone tell me what is wrong/incorrect.

Penguin · Dec 23, 2023

[ElectriciansForums.net] Can anyone tell me what is wrong/incorrect.

buzzlightyear · Dec 24, 2023

Penguin said:
Looking forward to the annual Xmas rerun of ‘Morecomb and Wise’ Christmas special.

I'm looking Forward to the two rodneys down the pub, so it's good night from him
sliding under the table.

littlespark · Dec 24, 2023

Morcombe and Wise, Two Ronnies???

Might I direct you fine gentlemen to another thread….

Littlesparks advent 2023

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Penguin · Dec 24, 2023

pc1966 said:
Glanding the cable to a metal fused-switch like the Wylex ones would have been far better, then double insulated tails to the meter.

It looks like the "filler" insulation around the 3 cores has been clamped or similar - wonder how that dent happened?View attachment 112405

Didn’t even see that dent/damage.
Looking at the size of the damage, it could have possibly been some sought of over tightened Earth strap? (But why)? I’ve run out of idea.

Merry Xmas

ipf · Dec 24, 2023

buzzlightyear said:
I'm looking Forward to the two rodneys down the pub, so it's good night from him
sliding under the table.

Only Fools and Rodneys???

littlespark said:
Morcombe and Wise, Two Ronnies???

Might I direct you fine gentlemen to another thread….

Morecambe........which one is buzz?

buzzlightyear · Dec 24, 2023

Norman wisdom films me loves.

GBDamo · Dec 26, 2023

The earth tag does not match the template laid out in BS7671.

The text should read,

"Safety Electrical Connection, Do Not Remove"

Not,

"Safety Electrical Earth, Do Not Remove"

I'd also argue the Hepworth branding should not be there and the standard Earth pictogram is not used.

Pedantic, yes, but it is a noncompliance.

DefyG · Dec 26, 2023

mmm! not so sure Id agree it as a non-compliance, Isn't there a passage in the regs that says "alternative 'systems/methods' etc shall not be precluded as long as safety isn't impaired" (or something like that as I Don't have regs book to hand )?

Alternative wording/pictograms hardly impairs safety and message is clear enough!

GBDamo · Dec 26, 2023

DefyG said:
mmm! not so sure Id agree it as a non-compliance, Isn't there a passage in the regs that says "alternative 'systems/methods' etc shall not be precluded as long as safety isn't impaired" (or something like that as I Don't have regs book to hand )?

Alternative wording/pictograms hardly impairs safety and message is clear enough!

OK so I was clutching at straws but it is the kind of thing examiners include solely to stop people getting full marks.

marconi · Dec 26, 2023

I am no expert on the regulations but wondered whether the sixth item is that the main equipotential bonding is done remote from the cutout location.

The according to the book ‘rule abiding‘ installation should have the earth conductor from the incoming N in the cutout going only a short distance to the main earth terminal bar, and then from this bar runs a cpc conductor to the dist boards, and separate EP bonding conductors for say water and gas connected also to the bar as in this figure.

With this scheme the cpc wiring and EP wiring do not share one conductor which might be considered a possible single point of failure. Just musing….

mainline · Dec 26, 2023

marconi said:
I am no expert on the regulations but wondered whether the sixth item is that the main equipotential bonding is done remote from the cutout location.

The according to the book ‘rule abiding‘ installation should have the earth conductor from the incoming N in the cutout going only a short distance to the main earth terminal bar, and then from this bar runs a cpc conductor to the dist boards, and separate EP bonding conductors for say water and gas connected also to the bar as in this figure.

With this scheme the cpc wiring and EP wiring do not share one conductor which might be considered a possible single point of failure. Just musing….

View attachment 112486

They replaced meter tails with SWA making the MET remote.
We don't know how the swa terminates or if it is downstream fused.
A bit of a botch, whatever way you look at it.

A Spn fused connection unit would have been the way, but even then could cause a moan from the dno for using the meter cabinet.

marconi · Dec 27, 2023

Just spotted there is a wiring fault in the figure I copied and posted in my #34.

westward10 · Dec 27, 2023

marconi said:
Just spotted there is a wiring fault in the figure I copied and posted in my #34.

Polarity is incorrect from the meter to the consumer unit

GBDamo · Dec 27, 2023

westward10 said:
Polarity is incorrect from the meter to the consumer unit

I'm not sure the polarity is wrong, but probably the tails are incorrectly identified.

Many meters have L-N-N-L terminal lay-out.

Whichever though, its not correct.

westward10 · Dec 27, 2023

GBDamo said:
I'm not sure the polarity is wrong, but probably the tails are incorrectly identified.

Many meters have L-N-N-L terminal lay-out.

Whichever though, its not correct.

You are correct, Marconi got his crayons mixed up

mainline · Dec 27, 2023

marconi · Dec 27, 2023

westward10 said:
You are correct, Marconi got his crayons mixed up

If only it was just my crayons......

Simon47 · Dec 31, 2023

marconi said:
I am no expert on the regulations but wondered whether the sixth item is that the main equipotential bonding is done remote from the cutout location.

The according to the book ‘rule abiding‘ installation should have the earth conductor from the incoming N in the cutout going only a short distance to the main earth terminal bar, and then from this bar runs a cpc conductor to the dist boards, and separate EP bonding conductors for say water and gas connected also to the bar as in this figure.

With this scheme the cpc wiring and EP wiring do not share one conductor which might be considered a possible single point of failure. Just musing….

View attachment 112486

I'd suggest the opposite.
Suppose you lose the connection between MET and CU ? Your bonding is now probably via the 0.75mm flex to the boiler. By running a connection direct from service head to CU and also taking your bonding cables to the CU, you've eliminated two connections and reduced the risk of incomplete/ineffective bonding.

baldelectrician · Jan 1, 2024

I do like these meters with the integrated isolator built in

I actually suggested (to SELECT) about 16 years ago when they were involved in the consultation for smart meters that these new meters should have a built in isolator

The feedback- it was refused as it would cost an extra £6 per meter.

freddo · Jan 1, 2024

baldelectrician said:
The feedback- it was refused as it would cost an extra £6 per meter.

This is why experienced engineers should be making the regulations not brain dead office staff. Surely a separate isolator in an enclosure and the extra time required to fit it would add up to more than £6?!