Its going to take an awful lot of dust for 'major overheating' to occur. My PC has run 12+ hours a day for well over a year in a room that is never cleaned (hey I'm normally a student!) and it never over heated.
Unless you are going to do PATS testing on something there isn't much you can do apart from check the condition of the plug/leads etc.
The only way to electrically safety check any electrical appliance is with the correct tools and that is with a PAT tester. In classI equipment (equipment with an earth) the Earth loop impedance needs testing along with the leakage currents under various fault conditions.
It doesn’t hurt to visually check mains plugs, not forgetting the correct fuse is fitted for the appliance in use, leads for their integrity, including the IEC plug (the plug the goes into the computer). Also extension leads, inspect them, if they look damaged in any way, don’t try and repair them, replace them, they are only pennies compared to a life.
In a work enviroment, electrical appliences can be inspected and tested by a non quilified electrcian only if that persons has attended a training course and once passed they can only carry on if they have recieved regular up-dates aprox once a year.
All employees are responsiable to report any damge to electriacl applience, and to ensure that the offended applience is not used, until inspected by a quilified electrcian ect.
My husband who works for the same campany as me, is our supervisor who has this responsiblity, on one occassion he actually cut a hover lead after he put a DO NOT USE notice on it, and the cleaners where caught ignoring this.
Has being the Health and saftey rep in his training sessions, when he gets to this part, his words are if you find something and feel that it might be used, then if it's got a detachable lead, throw it away. If not then unplugged the piece of equipment, and then if necessary break it beyond repair, so it can't be used.
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