03:16PM | 10/19/09
Member Since: 10/18/09
3 lifetime posts
Im confused with the formula-

Watts / volts = amps

Im running a wire from my one room to fuse box. Its going to be #10/2 wire on a 30 amp breaker. The equipment can be powered by 120v or 240v by simply changing the powercord, which has 3 prongs for the 240v. My equipment is 3000 watts and im almost possitive its 33 amps total. The equipment will run for about 8 hrs a day. My question is with the formula. Since im going with a 240v will it bring the total amps to 12.5 instead of the 33amps. 3000w/240v = 12.5amps. and then my 240v 30 amp breaker will be fine or do i have to go with 240v 8/2 gauge wire 40 amp breaker. thank you so much for your time and input.


07:54AM | 10/20/09
Member Since: 03/31/05
265 lifetime posts
And you would have to do more than just change the power cord.

3000W/240V=12.5A is correct. If it will run for more than 3 hours, then you apply a 1.25 factor bringing the amperage to 15.6. This could be wired using 12ga and a 20A breaker.


09:33AM | 10/20/09
Member Since: 07/22/04
530 lifetime posts
doesn't that make a difference also?


03:39AM | 10/21/09
Member Since: 10/18/09
3 lifetime posts
Thanks for the quick response. The distance from the room to fuse box is approx 50 ft of wire. I bought 10/2 gauge wire and a double 30amp breaker. The equipment is 3 1000 watt Quantum ballast(H.I.D Lighting). The equipment if im not mistaken will run for 8hrs a day. And with these ballasts there is a optional cord for 120v and 240v im going with the 240v both plugs are included for either 120v or 240v. Im still getting told that i have to run 10/2 and others are saying 10/3. I just want to make sure i install the right gauge wire so my electrician can just hook it up at box. I will return the breaker and 10/2 wire if need be.


06:29AM | 10/21/09
Member Since: 03/31/05
265 lifetime posts
If these are straight 240V lights (and they should be) you need 10/2 with ground not 10/3.

I'm almost afraid to ask what you might be doing with that kind of lighting in a residential setting.

Of course, if it is not residential, then you should not be doing any wiring there unless you are licensed, and if you were, you wouldn't be here.


03:16AM | 10/22/09
Member Since: 10/18/09
3 lifetime posts
im just gonna go on the safe side and go with 8/2 with ground black wire white wire and bare ground on 40 amp breaker 240v. thanks for all your responses and hopefully this keeps my wife busy for a few hrs a day.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

All bookworms need a good bookmark that inspires them to keep reading. To make this colorful bookmark, cut a rectangular p... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon