Discuss Shower EICR Code- 9.5kW- 40amp mcb!. De rate MCB to 32 or rewire cable to 10mm in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
That only applies if clipped direct , none are always underfloor and through roof!if installed ref. method C, 6.0mm is pessimistically rated @ 47A. what's the problem? shower is only 39.5A @ 240V, and that's probably over rated. bet a clamp meter would show no more than 35A. no code.move on.
9500 / 240 = 39.58If the shower is rated 9.5KW at 240V then at 230V it's 38A.
(240x240)/9500= 6.06 Ohms9500 / 240 = 39.58
9500 / 230 = 41.3
It's been a while since I did these sort of calculations at college, can you please explain why you have 240 X 240 then devide by 9500?(240x240)/9500= 6.06 Ohms
230V/6.06 Ohms=37.9 Amps
The resistance of the shower is fixed. If it states 9.5KW at 240V then it's not 9.5KW at 230V....More like 8.729KW.
It's been a while since I did these sort of calculations at college, can you please explain why you have 240 X 240 then devide by 9500?(240x240)/9500= 6.06 Ohms
230V/6.06 Ohms=37.9 Amps
The resistance of the shower is fixed. If it states 9.5KW at 240V then it's not 9.5KW at 230V....More like 8.729KW.
If the cable is clipped direct then it’s fine on a 40amp mcbI have to say the EICR is only to determine the current state of the installation unless there is a C1. Surely you as the tester have to define the condition of the installation and code appropriately. Remedial works and costs should not dictate the code you give it?
For me it's a C3 if the cable is clipped direct.
(1) R = V / IIt's been a while since I did these sort of calculations at college, can you please explain why you have 240 X 240 then devide by 9500?
It's been a while since I did these sort of calculations at college, can you please explain why you have 240 X 240 then devide by 9500?
If the cable is clipped direct then it’s fine on a 40amp mcb
It’s when it’s run through floor and roof voids it gets complicated! A 40 amp mcb does not protect the cable , a 32 will, but the load of the shower will cause a thermal effect on the cable and the MCB, HOWEVER both MCB and cable are designed to withstand higher currents for a certain amount of time, although my question was if we downrate the MCB as part of test I believe the code would be C3, no one can agree or offer a definitive solution
Brian Scaddens calls appear to make it ok with no code required?
A C3 Indicates “ improvement required”
Thanks guys, now I understand where I've gone wrongAs the two posts above
It honestly feels like you are trying to get out of putting in an unsatisfactory report.If the cable is clipped direct then it’s fine on a 40amp mcb
It’s when it’s run through floor and roof voids it gets complicated! A 40 amp mcb does not protect the cable , a 32 will, but the load of the shower will cause a thermal effect on the cable and the MCB, HOWEVER both MCB and cable are designed to withstand higher currents for a certain amount of time, although my question was if we downrate the MCB as part of test I believe the code would be C3, no one can agree or offer a definitive solution
Brian Scaddens calls appear to make it ok with no code required?
A C3 Indicates “ improvement required”
Reply to Shower EICR Code- 9.5kW- 40amp mcb!. De rate MCB to 32 or rewire cable to 10mm in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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