Have a system with a 420 watt psu. Plug fitted with 3 amp fuse. Keeps blowing!Do I need to fit a 13 amp fuse, or is the psu faulty?
suspect psu m8.johnny.
Proper fuse rating would be 5 amp.
You shouldn't go above 5.AMP NEVER PUT A 13.AMP INIf this continues you should replace your PSUmy computer runs well using a 300w PSU.
Looks like the PSU is faulty.(A 5 amp fuse is suitable for appliances up to 1200 watts, 13 amp fuse 3000 watts !!!)Call into your nearest Computer shop and purchase a new one - should be £15-25 or cheaper at a computer fair.
You're quite right about 13 amp, of course. Unfortunately, most new computers have 13 amp fuses fitted, as this is a standard lead. A good time for everyone to check their fuses.
Thanks folks, looks like I will be getting new psu.Thought my calculations were right, but better checking with PCA and being certain.
The fuse is there to protect the circuit NOT the appliance.........In other words even a 500watt PSU should not demand more than "2 and a bit"amps.A 13 amp fuse is sufficient for a large electric fire, and with finer wiring as in a computer could have a firey result when drawing close to 13 amps.
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