Knowledge.
Less than or equal to 3A is not correct, is it?
Less than or equal to 3A is not correct, is it?
Boiler wiring question
- Thread starter SensibleDev
- Start date
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How do you know it is not correct?
Because there is no minimum stated.
As I implied before, I certainly agree it is not 'satisfactory' for a statement in 'instructions', since it could lead to use of a fuse too small to allow the equipment to function. Whether one calls that 'incorrect' is a mater of opinion.
What they presumably mean is that, from the point-of-view of 'protection', the fuse rating "should not be greater than 3A". What they don't, but should, add is something like "... but should be greater than X to allow normal functioning of the equipment' - or, even simpler, that the fuse rating should be "between X and Y".
Kind Regards, John
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There is no minimum stated in 559.5.1.204 either, so I'm not sure what your objection is.
An instruction which states that one may use a fuse with which the equipment would not work is hardly correct, is it?
559.5.1.204 could lead to use of an overcurrent protective device too small to allow the lighting equipment to function.
So is 559.5.1.204 incorrect?
Ok. I may be being a bit picky but I don't think that ≤ is the same as maximum.
1mA complies with ≤3A.
Well, it's certainly daft. As I said, if they feel they have to state a maximum fuse rating (to provide 'adequate protection'), then I suppose they are entitled to - but they certainly ought to also indicate the minimum that will allow the equipment to function.
In practice, of course, unlike me, most people probably don't even realise that BS1362 fuses rated below 3A exist, let alone have any <3A, so will presumably interpret the instruction as meaning that they should use a 3A fuse.
I seem to recall that we have discussed this before in relation to other things, and that it's not actually unusual for MIs to state only a maximum rating of fuse or other OPD - similarly 'incorrect' in terms of your view.
Kind Regards, John
I've already mention a 1mA one!
However, to be equally picky, I would say that ≤3A does mean "3A maximum", doesn't it? If not, why not?
Kind Regards, John
That's not "picky", it's "bonkers", of course it is the same.
1mA complies with "maximum rating 16A"
Yes, but it does not specify a minimum.
Not in the same way.
If you two disagree with me, fair enough, I don't think it worth arguing.
If I am wrong, then so must be MI's which state just a maximum.
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