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Forum topic by Garyb6 posted 02-07-2009 03:14 AM 774 views 0 times favorited 5 replies Add to Favorites Watch
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Garyb6

306 posts in 2352 days


02-07-2009 03:14 AM

Topic tags/keywords: question electrical

I am making a dust filter from an old HVAC fan. The fan is a 220V, 2A, 1/3 HP fan with 3 speeds. I am planning to buy a 4 position switch for control. I was at the hardware store today and the switch I was going to purchase was labeled 230V, 3A, 1/4 HP. I didn’t get it because of the 1/4 HP rating. I know I am a little rusty with my electrical theory but what does HP have to do with a switch? HP is calculated using Voltage, current and motor effeciency.

So I think this switch would be OK, but wanted to check with some of you smart guys out there.

Thanks,
Gary

-- Garyb6, “True simplicity does not reveal the tremendous effort it requires.” - Somerset Maugham


5 replies so far

View Scot's profile

Scot

344 posts in 2118 days


#1 posted 02-07-2009 03:21 AM

The amperage is the important thing to look for. The switch you found should work just fine.

-- If the old masters had power tools, they would have used them. So get off your damn High Horse.

View bendisplays's profile

bendisplays

39 posts in 2122 days


#2 posted 02-07-2009 05:04 AM

Gary,

The rating on the switch is the maximum horse power that it can handle. So if it is rated 1/4 hp, then that is the maximum power the switch can drive.

1/3 hp is higher than 1/4 so the switch will not handle 1/3 hp.

I hope this helps.

Cheers,

Ben

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Garyb6

306 posts in 2352 days


#3 posted 02-07-2009 07:24 PM

OK. One person says yes and one says no. I guess I’ll err on the side of caution and try to find another switch.

Thanks,
Gary

-- Garyb6, “True simplicity does not reveal the tremendous effort it requires.” - Somerset Maugham

View GFYS's profile

GFYS

711 posts in 2193 days


#4 posted 02-07-2009 07:41 PM

It could be that start amps are figured into the HP rating.

View Al Killian's profile

Al Killian

273 posts in 2475 days


#5 posted 02-08-2009 08:14 AM

Go to a electrical supply place. They will have the proper switch for you.

-- Owner of custom millwork shop

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