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1shortcircuit
the onsite guide is an example of 'kiss' and is just a guide
keep it simple stupid
Discuss in after a cowboy, cooker nearly burnt the house down! in the Electrical Forum area at ElectriciansForums.net
the onsite guide is an example of 'kiss' and is just a guide
not simple enough apparantly.
;-)
the very last sentance on that page says " the remainder of the installation would require protection by a 100mA rcd"
which implies not every circuit must need 30mA rcd for it to say that ??
not much gratitude there for walking you through your job exarmy ? :-/
It doesnt matter what sort of wiring the house has , even if it is in steel conduit or not.
Its only your work that has to be considered , so if you install a cable to your new cooker spur , that has to be 30mA rcd protected , which will mean fitting a rcd at the mains even though theres a 100mA rcd already there.
OR
Fit the new cable in surface trunking then you dont have to fit extra 30mA rcd.
..................Thats just my take on it so please dont shoot me. Can someone get my gun.
Also as its now on its own dedicated radial Its not on any circuit - he hasnt done the job yet.
it will look awful and you will get the name John Wayne. The mans a legend.
230 volts is just the baseline for design calcs where supply details arent known.
If you know the actual voltage , in this case 250v , then use that value.
"cables installed on the surface do not specifically require RCD protection, however, RCD protection may be required for other reasons, for example, for the fault protection, where the earth fault loop impedance is such that the disconnection time for an overcurrent device cannot be met"
230 volts should always be used what happens when the the DNO changes the transformer trappings of carry out switching in the area.
Stick with 230v
is there something that says fixed equipment over 2KW has to be on a dedicated radial? it's just that i wouldn't know how to justify that to the customer, it's only 3.2KW, almost the same as a kettle!
and regarding surface mounting to avoid having to fit RCD, ihave just come accross Reg 411.5:
"cables installed on the surface do not specifically require RCD protection, however, RCD protection may be required for other reasons, for example, for the fault protection, where the earth fault loop impedance is such that the disconnection time for an overcurrent device cannot be met"
230 volts should always be used what happens when the the DNO changes the transformer trappings of carry out switching in the area.
Stick with 230v
Simple test and compare to max Zs for the protective device
Reply to in after a cowboy, cooker nearly burnt the house down! in the Electrical Forum area at ElectriciansForums.net
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