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Thread: Fuse blower
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2nd July 2006, 09:15 AM #1
Fuse blower
Over the last few months I've managed to almost bring to life an old bandsaw (32" wheels). It came with a 3 phase 3hp motor which makes a good door stop but otherwise useless unless I fork out the big bucks for 3 ph.
The new 3hp cap start/cap run single phase motor drives the lower wheel with no blade attached no worries. As soon as I put a blade on it it gets to maybe 3/4 speed and blows the fuse.
I'm wondering whether I need to get the electrician in to run dedicated power to the shed rather than from the nearest power plug in the house thus lessening the complaints from the computer users and telly watchers. Is it some sort of overload problem I can fix at the bandsaw end. Why wouldn't the motor overload switch cut off if there is too much strain.
Note to self: keep suggesting to son that a career as an electrician would be extremely profitable.
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2nd July 2006, 10:48 AM #2
Classic lack of power is what you are experiencing. If you keep trying to get that motor going with the supply you have, the motor will burn out for sure.
If you are going to get a sparky to wire your shed, and you intend to stay in your present location, run the thickest supply cable that you can afford.
Some service mains on domestic supplies, drop to 10mm sq wire from the comsumer mains, down to the board. If it were me, I would get the sparky to change this to the maximum, which is 16mm sq. I would run the whole lot (ie active and neutral) in 16mm to your shed as well, and have a 100 amp breaker for this new supply mounted in your fuse box.
Put a small sub board in your shed for circuit protection, and drive in an earth stake at the shed.
If you go for the "I just want a power point in my shed" Route, You will have paid out good money, and your 2200w motor will still burn out.
Dig once and do it properly. I wish I had done so.
Hope this helps.
[EDIT] On re reading my post, I think I may have suggested a bit of overkill. The above is what "I" wish I had done. If you want to start a 3hp motor at a distance of 40m from your mains, 4mm active and neutral will just suffice. The rest would be mandatory though.[/EDIT]
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2nd July 2006, 03:36 PM #3
Thanks Fossil,
Actually the digging was done years ago. From memory the shed power comes out of the back of a handy house power point along a heavy duty extension lead (16amp??) underground and then around various power points and lights in the shed. All done by an electrician I should add. House to shed is about 10 metres, Fuse box to house power point about 20m as the crow flies. Oh, and shed power point to bandsaw is an ordinary extension lead about 20m long (3m would do!)
And what's worse just this morning I cut down three blackwoods and have four logs 12" diam x 8' long waiting for some attention
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