Fused spurs are not used or needed on a lighting circuit. It is already fused at 5 amp. If you must run it off the lighting circuit all that is needed is a switch.
Heating an airing cupboard
- Thread starter Lofty Bob
- Start date
Fused spurs are not used or needed on a lighting circuit. It is already fused at 5 amp. If you must run it off the lighting circuit all that is needed is a switch.
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Why? Has he made something so flaky that it has to rely on circuit protection for its own health? The circuit device is there to protect the cable, not for any other reason.
There's nothing 'flaky' about taking the expected characteristics of circuit protective devices into account when designing a product.
Unnecessarily high for the 3kW immersion, yes. Perhaps the installer thought it might in the future be useful for an electric shower, or he had some 6mm and a 32A mcb to use up
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There is nothing but flakiness.
The circuit device is there to protect the cable, not for any other reason.
I'd agree with you, but than we'd both be wrong.
Apart from any generic requirements for obeying/taking-note-of MIs, what rights do electrical equipment manufacturers have to override wiring regulations requirements for overload and fault protections of circuit cables?
If you agreed with me we would both be right. If you don't then I am right and you are wrong. If the HokiKoki2000 Transmogrifier needs its innards to be protected by a 5A fuse then the makers must embed such a fuse in the innards, not insist that it be applied to the circuit supplying it.
If you agreed with me we would both be right. If you don't then I am right and you are wrong. If the HokiKoki2000 Transmogrifier needs its innards to be protected by a 5A fuse then the makers must embed such a fuse in the innards, not insist that it be applied to the circuit supplying it.
None at all. They aren't.
So what would prompt an ultra-vires instruction in an MI other than the knowledge that they'd designed a product which had to rely on a level of circuit protection which they had no right to expect?
None. But they have every right to design their products in such a way that they require a certain level of overcurrent protection for that product and to specify in their installation instructions that such protection should be included.
I disagree.
As a basic principle they may not rely on something which is not there to protect their equipment.
As a basic principle they may not rely on something which is not there to protect their equipment.
So the manufacturer of a 20W exhaust fan must design it so that it can be safely connected to a 200A branch circuit?
He is not required to equip it with terminals that can accept the conductor sizes that would be used on such a circuit.
But in terms of protections, yes - the OPD is not there for him, it is there for the circuit cables.
But in terms of protections, yes - the OPD is not there for him, it is there for the circuit cables.
Sounds plausible, just somewhat unusual.
30A circuits for electric water heaters are pretty common here, by the way, but the most usual element size is around 4.5kW.
So if the HokiKoki2000 Transmogrifier requires free access to air to operate properly and safely, does that mean it must come with its own internal air supply and the manufacturer shouldn't be able to specify in his instructions that it be installed somewhere with adequate ventilation?
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