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Posted By leerob
Upon carrying out a risk assessment for my office ,i stated that all electric appliances should be switched off at the end of each working day ,bearing in mind its an electrical contractors am working for ,one of my fellow electrical colleagues has pointed out that if there is a 4 way extension plugged into another and so on that as long as there is a 13 amp fuse in the first plug then this is safe as the fuse would blow first.
Also if the computers are off of a night then there not drawing any electric.
Any comments welcome??
Cheers
Lee
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Posted By Flic
It depends what you are trying to achieve. Switching off is good practice as it saves electricity.
I would challenge the person who told you that a set of daisy chained extension leads is OK if there is a 13amp fuse in it. First, daisy chaining is very bad practice - you can totally lose sight of how much current you are drawing from the original socket. Second, fuses can withstand significantly high over-currents. When overloaded fuses may, or may not, blow before the place catches fire.
Flic
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Posted By Larry
Daisy chaining is simply poor practice and sets low standards which may not be met.
As for computers not drawing power when switched off. If it is a laptop (even if it is in a docking station), then it normally uses DC power. That means that so long as the plug is in the socket and switched on then the transformer will still be doing its thing and using electricity. Two issues there. One they get very hot. Two it wastes electricity. The theory also applies to your mobile phone charger left plugged in and switched on at the socket with no mobile attached.
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Posted By John Richards
Most [personal] computers are not "off" when switched "off".
They would be more correctly described as "powered down". The power supply (usually switched-mode) is still connected to the supply and drawing a small amount of power.
A 13 amp fuse is a fine item, very good at protecting things if there is a direct short circuit, but not so good if an item of equipment has a malfunction and decides to draw more current than usual. It may even allow currents higher than 13 amperes, as long as they are not applied suddenly. Loads of fires have been caused by equipment overheating due to faults, where the 13 amp fuse has survived unharmed.
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