Table 4F3A is silent about 'installation method', but I would imagine the assumption is that, by their very nature, 'flexible cords' usually are in free air (or -ish).
I'm a bit lost. I find it hard to imagine any sums you could do would get an answer of 16A or more for the CCC of a cable with a tabulated CCC of 3A - and UK safety culture (aka BS7671) requires the In of the OPD to be no greater than the Iz of the cable.
I have not seen double fuses in German equipment which can have the line and neutral swapped. Yes often twin pole switching but the larger equipment clearly does lack some of our safety features.
Makes cable replacement much easier.
Different country, different rules.
I could do the same for many UK factories. And fill books for some other european countries. But the workers seem to be more aware of self protection than the nannny state proted workers in the UK.
The system is promoted as being safe but as a result the work place is less safe from the un-foreseen and unprepared for accidents.
That's overload protection. I was talking about fault protection.
Ah, apologies, I missed that little word - primarily because we seemed to be talking about overload protection, so I 'saw what I expected to see'. Anyway, you're very probably right about the fault protection, but is there not a need for overload protection as well?
When it develops a short circuit. When someone turns all the ring on a 7Kw hob connected to a 13 amp socket with a solid bar in the fuse holder.
Interesting one!
That's another debate you could trigger, but I'll try not to start it! The standard traditional answer is that the fuse is only there to protect the cable (cable to the gas cooker), not what is beyond that cable (i.e. the igniters in the cooker)- so, if the cable is meaty enough to take 13A, then a 13A fuse is 'appropriate'. Some of us feel more like the way you are thinking!!
Because many flexible cables are rated to carry far less than 13A - say 3A or 6A, and a 13A fuse will allow a lot more than 13A to flow before blowing. As for your argument about CSAs, the cable will suffer serious damage long before it gets to the ;point of 'popping' like the fuse wire.
That sounds like a totally different question, rather than 'putting it another way'! Anyway, you're getting close to 'the debate'! (B) may well not happen - e.g. the operator may be somewhere else! As for (C), "drawing 7or 10 Amps" obviously wouldn't trip an MCB on a socket circuit - commonly 32A, and virtually never less than 16A. That leaves one with (A), which is where debate occurs.
Particularly in the case of very low current loads (e.g. many electronic devices), for which a 1A or 3A fuse may well be adequate), some of us believe that it's prudent to use as low a rating of fuse as possible in order to possibly limit internal damage (and maybe even fires, if some very fine wires are within the equipment) from currents which would not trip an MCB. A ,ot of the debate is about how likely it is that a fault would occur in such equipment which would result in excessive current but not enough to trip and MCB.
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