Electric panel heaters..??

[sparkyjohn1]

I recently had another spark ring me up , about a job i completed late last year.Ranting that I havn't installed the heating circuit correctly, and i should re-visit to property to correct it.

The property didn't have a gas supply, so was asked to supply and Install a heating solution. ( electric rads / heaters etc.)

I have included a picture. ##best schematic diagram i could do on microsoft paint.##

This is how i did the job,, please tell me if you can find anything wrong with it..

Only thing i can think of is that the IN-LINE STAT, maybe borderline regarding max current draw,,,rated 16amp. but that is about it.. everything else seems o.k,??

Please let me know if you have any feedback..
thanks

 

[Octopus]

What did he say is wrong?

 

[sparkyjohn1]

I don't know,, just asked me to go round, meet him on site, to discuss snags,,, the heating being one of them,, amongst other petty things.
My guess is he thinks the stat aint 'man enough' as most stats are not rated at 16 amps.. I had to search high and low for that one.... especially being an 'in-line' one most are remote, or wired through contactors, it was the best way i could think of doing it per the clients request,,. Also please note , that the heaters were going to be 2Kw at the start, with no stat,(individually controlled) (thats why the 6mm was used as main feed ).. and 10 amp breakers, downstream. but I made a calc of volume of the rooms they were feeding and 1Kw seemed more of a feasible solution..

 

[monkeyelectric]

I don't know,, just asked me to go round, meet him on site, to discuss snags,,, the heating being one of them,, amongst other petty things.
My guess is he thinks the stat aint 'man enough' as most stats are not rated at 16 amps.. I had to search high and low for that one.... especially being an 'in-line' one most are remote, or wired through contactors, it was the best way i could think of doing it per the clients request,,. Also please note , that the heaters were going to be 2Kw at the start, with no stat,(individually controlled) (thats why the 6mm was used as main feed ).. and 10 amp breakers, downstream. but I made a calc of volume of the rooms they were feeding and 1Kw seemed more of a feasible solution..

Its probably because the breaker to supply all the heaters is 40amp which then runs through a 16amp stat

 

[tazz]

Too right, the only protection this 16a stat has, is a 40amp mcb, you should have used a contactor

 

[londonlec]

I would have fed a contactor from that timer, even though it is rated for the load.

 

[sparkyjohn1]

yeah, i realise this,, but the stat was an after thought,,, after the heaters were downgraded to 1 Kw,,I had already wired. it for the 2Kw models.. the wiring and the breakers involved are all 'over compensating ' the max current draw, and the stat is equal to max current draw if you take 1Kw x 4 = 4kW.. roughly equates to 16 amp.?! I do realise the confusion the M.C.B may have caused but everything seems o'k AND electrically safe to me..

 

[tazz]

I would power the timeswitch off a 6a mcb or lower, and use a contactor off the 40a mcb to supply 2nd cu

 

[MDJ]

you can buy 20 amp stats, change the breaker to 20 amp as well and your done, however a contactor would have been the way to do the job.

 

[monkeyelectric]

yeah, i realise this,, but the stat was an after thought,,, after the heaters were downgraded to 1 Kw,,I had already wired. it for the 2Kw models.. the wiring and the breakers involved are all 'over compensating ' the max current draw, and the stat is equal to max current draw if you take 1Kw x 4 = 4kW.. roughly equates to 16 amp.?! I do realise the confusion the M.C.B may have caused but everything seems o'k AND electrically safe to me..

What would happen should they replace the panel heaters with 2kW heaters then your stat would melt!

 

[sparkyjohn1]

how about I just change the main M.C.B for a 16 AMP one.? not one for cutting corners, as I'd thought i'd covered all areas, but would that cure the situation,,,? then maybe changing the M.C.B'S Downstream too?? maybe 6 amp? each,?

 

[wozz]

1kW? how small are these rooms?

Slight overload on stat, and stats dont always switch what they say they can.

Congrats on terminating 6mm in a stat.

How is the 6mm installed?

 

[MDJ]

how about I just change the main M.C.B for a 16 AMP one.? not one for cutting corners, as I'd thought i'd covered all areas, but would that cure the situation,,,? then maybe changing the M.C.B'S Downstream too?? maybe 6 amp? each,?

4kw at 230 volt ? 16 amp? stick a 20 in and be done with it, however if you added a contactor in to the supply from the main db to the small db, you could have the stat control the coil.

 

[sparkyjohn1]

I'll search for a 20 amp in line stat... and go with the comment above MDJ

 

[wozz]

What would happen should they replace the panel heaters with 2kW heaters then your stat would melt!

same can be said for almost anything, 7671 doesnt mean you have to futureproof installations for incompetence.