I take it that you can show how and where an air supply is within the scope of electrical installation wiring?
Heating an airing cupboard
- Thread starter Lofty Bob
- Start date
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It isn't, but that's the point.
If you accept that the manufacturer may specify in his installation instructions that the HokiKoki2000 Transmogrifier must be located where it will have an adequate supply of air, (or that it must be mounted level, or that it must not be installed where subject to freezing temperatures, or whatever) then why shouldn't he be able to specify that it must be connected to a source of power protected by a fuse or circuit breaker not exceeding X amps?
You were doing alright there, until you added "cables".
Bottom line: If you're connecting the small tubular heater into the existing 5A lighting circuit, a simple switch will suffice. If you're adapting the immersion heater feed or spurring from an existing socket ring or radial, fit a switched FCU so you can provide an appropriate 3 or 5A fuse.
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Because the fuse or circuit breaker is not there to protect the innards of his product. If he wants one to do that then he must put it in his equipment.
Says who?
What do you mean?
JPEL/64
That you should have stopped when you got as far as "it is there for the circuit."
I must have missed the news that equipment manufacturers are now bound by the decisions of that particular committee then, if you think that's a valid argument.
They aren't.
But nor are their products within the scope of BS 7671, and they may not attempt to superimpose their requirements on it.
But nor are their products within the scope of BS 7671, and they may not attempt to superimpose their requirements on it.
They're not. They're stating their requirements for the proper and safe installation and operation of their equipment. Besides, doesn't BS7671 itself say something about following manufacturer's instructions anyway? So how can it be an attempt to "superimpose" a requirement on BS7671 which BS7671 itself says should be followed?
Yes they are.
They are stating that for their equipment to be safe to use the normal relationship of Ib ≤ In ≤ Iz may not be used, and that somehow their equipment, which is not within the scope of BS 7671, must be allowed to influence the design.
BS 7671 does not say that attempts to subvert the design of the installation because the manufacturer has been unable to make a product which is intrinsically safe should be allowed.
How do you think you can design the electrical installation of a house without the choice of appliances infuencing it in some way?
The loads which are to be run are bound to have some influence on the wiring put in place to power them. I can't imagine why, but for some reason I have the urge to say, "That's how it works."
The loads which are to be run are bound to have some influence on the wiring put in place to power them. I can't imagine why, but for some reason I have the urge to say, "That's how it works."
Indeed they do.
So let's say that my Hokikoki2000 Transmogrifier is a 2kW load.
The influence it therefore has is that 8.7 ≤ In ≤ Iz.
As far as I am concerned, and as far as BS 7671 is concerned, an In of 32A and an Iz ≥ 32A is perfectly OK. Their equipment is not within the scope of BS 7671 and if they have made it such that a 10A device is needed to protect it then that 10A device should be in the equipment.
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