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There are plenty of hairdriers over 2000W in Argos. Here's one:
www.argos.co.uk/static/Product/partNumber/4435107....m
500 watts is [fractionally over] 2 amps. To restrict each room to this level they would have to fit a 2 amp fuse. This would require a custom built fuseboard. Unlikely.
The smallest standard size of MCB is 6 amp, which is normally used for lighting and is good for 1250W continuous and can let through about 1600W for about 6 minutes before tripping.
It would be more usual for a single room socket circuit to be protected by a 16 or 20 amp MCB. That's 4000 or 5000 watts continuous capacity. Though if it's a recent build they may have specified 10 amps MCBs - but that is still 2300W continuous (so even that 2300W hairdrier would never trip it).
How many rooms in these halls? 100s? Even large TPN boards are usually only 54 way, so to provide rooms with individual fusing would require a lot of boards. Obviously depends how it's laid out?
I would have thought it more likely that rooms are fused in groups of around 4 or 5 at 20 amps shared. Highly unlikely more than one room at a time would be running a hair drier, so no problem, but if they all tried running a fan heater at the same time it would trip.
Try plugging inthe hairdrier and see what happens. Leave it on for about 10 mins.
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