Landlords test certificate.

[ban-all-sheds]

Is a spur subject to the same limitations?

Spur or not is irrelevant. What's it supplying?

In this case is it a BS 1363 accessory, or a CU?

If the latter and not the former, please show how the 2.5mm² cable on a 32A breaker complies.

Are you of the belief that BS1363 FCUs are the only additional fusing method allowed on a ring and/or spur?

Are you of the belief that 433.1.204 allows anything else?

 

[Iggifer]

Is a spur subject to the same limitations?

Spur or not is irrelevant. What's it supplying?

In this case is it a BS 1363 accessory, or a CU?

If the latter and not the former, please show how the 2.5mm² cable on a 32A breaker complies.

Where is this 2.5mm² cable protected by a 32A OPD?

House to shed 4.0mm² 32A MCB
Shed radial 2.5mm² 20A MCB

Sounds fine to me (in terms of CCC and OPDs)

 

[ban-all-sheds]

Where is this 2.5mm² cable protected by a 32A OPD?

Here:

The swa is terminated in a box on the outside wall which is fed from an internal socket on a 32A ring circuit.

 

[Iggifer]

Where is this 2.5mm² cable protected by a 32A OPD?

Here:

The swa is terminated in a box on the outside wall which is fed from an internal socket on a 32A ring circuit.

Why does that mean it's spurred in 2.5mm²? When the OP clearly said, in the very first post in the thread

The supply is taken from a house socket on a 32A mcb using 4.00sqmm swa cable

 

[ban-all-sheds]

Oh - and you think that the ring final on the 32A MCB is wired in something larger than 2.5mm²?

 

[JohnW2]

Where is this 2.5mm² cable protected by a 32A OPD?

Here:

The swa is terminated in a box on the outside wall which is fed from an internal socket on a 32A ring circuit.

You may be right, but you're only guessing/assuming, possibly incorrectly. We know that the SWA is 4mm², so it would be far from beyond possibility that the cable connecting the SWA to the ring is also 4mm².

Kind Regards, John

 

[Iggifer]

Where is this 2.5mm² cable protected by a 32A OPD?

Here:

The swa is terminated in a box on the outside wall which is fed from an internal socket on a 32A ring circuit.

You may be right, but you're only guessing/assuming, possibly incorrectly. We know that the SWA is 4mm², so it would be far from beyond possibility that the cable connecting the SWA to the ring is also 4mm².

Kind Regards, John

Well, it would be stupid to not use the SWA to connect to the ring. Terminate into the box, no connections, take the SWA inner sheath straight into the socket, job done. But you're right, it may not be 4.0mm²

 

[JohnW2]

Oh - and you think that the ring final on the 32A MCB is wired in something larger than 2.5mm²?

The ring itself is obviously allowed to be wired in 2.5mm² on a 32A MCB. The question is about the spur cable and, as I've just written, you can only guess about the CSA of the cable between the ring and the (4mm²) SWA. Guessing is not good.

Kind Regards, John

 

[Iggifer]

Oh - and you think that the ring final on the 32A MCB is wired in something larger than 2.5mm²?

No there's a 99% chance the ring is wired in 2.5mm², but that's clearly acceptable, and not really relevant

 

[JohnW2]

Well, it would be stupid to not use the SWA to connect to the ring. Terminate into the box, no connections, take the SWA inner sheath straight into the socket, job done. But you're right, it may not be 4.0mm²

Agreed, but you are misrepresenting me - my point was that it MAY be 4mm² all the way to the ring. It is BAS, not me, who appears to be guessing/assuming that it isn't!

Kind Regards, John

 

[ban-all-sheds]

Of course it is relevant.

Let's try again.

Does a circuit supplying indeterminate loads which are not prevented from reaching 32A, on a 32A OPD, but wired using a cable with a CCC of < 32A comply with 433.1.1?

 

[ban-all-sheds]

Well, it would be stupid to not use the SWA to connect to the ring. Terminate into the box, no connections, take the SWA inner sheath straight into the socket, job done. But you're right, it may not be 4.0mm²

Agreed, but you are misrepresenting me - my point was that it MAY be 4mm² all the way to the ring. It is BAS, not me, who appears to be guessing/assuming that it isn't!

I'm guessing/assuming (and I feel I am on solid ground there), that the ring is wired using 2.5mm², not 4mm².

What the spur is wired in is of no relevance whatsoever.

 

[JohnW2]

Does a circuit supplying indeterminate loads which are not prevented from reaching 32A, on a 32A OPD, but wired using a cable with a CCC of < 32A comply with 433.1.1?

Only, as you know, if it's a ring final. As for the spur, we know that most of it probably has a CCC of 32A, and your just guessing about the last few inches/feet.

Kind Regards, John

 

[Iggifer]

Well, it would be stupid to not use the SWA to connect to the ring. Terminate into the box, no connections, take the SWA inner sheath straight into the socket, job done. But you're right, it may not be 4.0mm²

Agreed, but you are misrepresenting me - my point was that it MAY be 4mm² all the way to the ring. It is BAS, not me, who appears to be guessing/assuming that it isn't!

Kind Regards, John

Oh, I see. In that case, my mistake

 

[JohnW2]

I'm guessing/assuming (and I feel I am on solid ground there), that the ring is wired using 2.5mm², not 4mm².

.. and you're almost certainly correct.

What the spur is wired in is of no relevance whatsoever.

I'm lost - I thought it was the spur that concerned you.

Since the ring final itself, wired in 2.5mm² cable and protected by a 32A MCB would (given a few caveats) be allowed to supply, say, 50 x 13A sockets or FCUs, I don't really see what point you are trying to make.

... but it is 'late on a Friday night' !

Kind Regards, John