Appendix 15 (Informative)

[GBDamo]

The load current of the circuit should be unlikely to exceed for long periods the current carrying capacity of the cable (regulation 433.1.204). This can generally be achieved by:
(i).....

(ii) not supplying immersion heaters.....

(iii) connecting cookers, ovens, and hobs with a power exceeding 2kW on their own dedicated circuit.

Now a timer that supplies a 2kW immersion heater, programmed to come on for one hour in the early hours, has been fitted to a FCU that is spurred off a RFC.

Am I being unreasonable in insisting a new circuit is run in for the immersion?

 

[Octopus]

Yes. You are being unreasonable.

There are hundreds of thousands of homes with immersions on RFC

 

[paul291277]

The FCU can handle the current so you need to look at demand on the RFC to see if theres going to be an issue, probably not going to be a problem though

 

[GBDamo]

Yes. You are being unreasonable.

There are hundreds of thousands of homes with immersions on RFC

Maybe, but how many of those have been signed off as compliant with the BYB?
This is a new installation requiring certification.

 

[buzzlightyear]

Am I being unreasonable in insisting a new circuit is run in for the immersion?

yes is the answer .3kw heater needs to be on circuit with 20amp d/p switch

 

[Des 56]

Am I being unreasonable in insisting a new circuit is run in for the immersion?

You are a more powerful electrician than me,I can only suggest to people what they should do,if I did insist my clients may tell me with words to the effect of "walk gingerly out of the door"

On a new installation,given the circumstances I would also be concerned about the rest of the installation
A fine tooth Comb may be required

 

[GBDamo]

Am I being unreasonable in insisting a new circuit is run in for the immersion?

You are a more powerful electrician than me,I can only suggest to people what they should do,if I did insist my clients may tell me with words to the effect of "walk gingerly out of the door"

On a new installation,given the circumstances I would also be concerned about the rest of the installation
A fine tooth Comb may be required

Embarrassingly, this has been picked as a QS review issue, the insistence is for us to put this right.

The rest of the install was not done by us.

 

[Taylortwocities]

My own opinion is that an immersion on an RFC is OK if the immersion is only used as a back-up for the main DHW heating system (eg a boiler).

If it is the primary herating source then a separate circuit is needed.

The often misunderstood App 15 is informative and for guidance only. But some QS have their own particular bees in their bonnets, so you may have a hard time.

 

[Octopus]

Maybe, but how many of those have been signed off as compliant with the BYB?
This is a new installation requiring certification.

In which case I would TELL the muppet who did this to come back and do it properly.

 

[Octopus]

^^ so your company is testing and inspecting - who signed off the design? and installation?

 

[buzzlightyear]

The rest of the install was not done by us.

but who. come on spill the beans
start sing like a canary ,

 

[GBDamo]

^^ so your company is testing and inspecting - who signed off the design? and installation?

Exactly.

This is a historic issue, putting right someone else's sparkie droppings.

 

[Octopus]

Exactly.

This is a historic issue, putting right someone else's sparkie droppings.

That doesn't answer my question...

 

[buzzlightyear]

who are you pointing your finger at?

 

[GBDamo]

That doesn't answer my question...

Let's just say this job was done eight months ago and the design spec and installation procedure were written six months ago and leave it at that.

 

[buzzlightyear]

pm me and tell me .

 

[Taylortwocities]

Job done, certified and completed eight months ago?

 

[GBDamo]

who are you pointing your finger at?

Contract "sparkies" contracted by us hence the original question.

 

[buzzlightyear]

is this a wink has good has a nudge ?

 

[Taylortwocities]

Ok, and this is hard work.
What did the design specify for the immersion heater feed?