Electrics

Well, to answer your original question - yes, it will be as alright as the 3kW one on the circuit.

However, it is a very poor design as the 13A which the shower uses only leaves 3A for the other eight things, presumably sockets but we don't know, on the circuit which is likely to cause tripping and wear on the MCB.

We cannot say why it has been fitted with a 16A MCB.
It may be possible to increase this but we cannot tell from here.

It does say in the instructions that it should be fitted with a Fused Connection Unit but some 13A accessories and fuses don't like 13A currents.

stillp said:

Stormie said:

Reading from the circuit chart it states that the shower is part of ring main 2/2, Sockets and shower, Wiring type A, Reference Method 100, number of points 8, Conductors Live 2.5 sq mm, cpc 1.5 sq mm, BS(EN)60898, Type B, Rating (A) 16, short circuit capacity (ka) 6, RCD operating current 30.

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So it's not a dedicated supply, but part of a ring, yet it has a 16A MCB?

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Indeed, it seems extraordinary. Assuming it really is a ring, 2.5mm² Method 100 qualifies for a 32A MCB per regs (433.1.204). Even if 'ring' were a 'typo' and it were a radial (or even a 'broken ring'), it could have a 20A MCB.

Kind Regards, John

I'm not clear if this appliance is being connected to a 13 amp fused spur or not.

13 amp supply has been mentioned.

As far as I can see the appliance is just over 13 amp, so shouldn't be connected to a 13 amp fused spur.

Would have reservations about connecting it directly to this 16 amp socket supply, particularly if it's supposed to be a ring circuit.

sparkwright said:

I'm not clear if this appliance is being connected to a 13 amp fused spur or not. 13 amp supply has been mentioned.

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I don't think any of us are clear about that!

sparkwright said:

As far as I can see the appliance is just over 13 amp, so shouldn't be connected to a 13 amp fused spur. ... Would have reservations about connecting it directly to this 16 amp socket supply, particularly if it's supposed to be a ring circuit.

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I would agree with all that, other than "...particularly if it's supposed to be a ring circuit". If it's really a ring, the cable is so over-protected that there would be no concerns because it is a ring! IMO, the main issues are those you raised - the fact that it may (or may not!) be intended to wire a load which might be a bit over 13A via an FCU and the concept of having a ~13A 'fixed' load running off a 16A circuit which appears to have 8 other (presumably sockets) outlets!

Kind Regards, John

JohnW2 said:

sparkwright said:

I'm not clear if this appliance is being connected to a 13 amp fused spur or not. 13 amp supply has been mentioned.

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I don't think any of us are clear about that!

sparkwright said:

As far as I can see the appliance is just over 13 amp, so shouldn't be connected to a 13 amp fused spur. ... Would have reservations about connecting it directly to this 16 amp socket supply, particularly if it's supposed to be a ring circuit.

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I would agree with all that, other than "...particularly if it's supposed to be a ring circuit". If it's really a ring, the cable is so over-protected that there would be no concerns because it is a ring! IMO, the main issues are those you raised - the fact that it may (or may not!) be intended to wire a load which might be a bit over 13A via an FCU and the concept of having a ~13A 'fixed' load running off a 16A circuit which appears to have 8 other (presumably sockets) outlets!

Kind Regards, John

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Thank you all for your time and inputs. it is obviously not as straightforward as we expected, and to this end we will have to wait until we can speak to our electrician. Once again thanks all for your advice