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Old 08-28-2010, 11:13 AM   #1
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changing amperage

I currently have, I believe, a 30A load capability to my shed. I would like to increase the load enough to accommodate my freezer, which runs all the time, and allow me to run my lighting as well as occasionally running my miter saw and table saw, but not necessarily at the same time. My question is: what would be involved?
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Old 08-28-2010, 11:28 AM   #2
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How heavy is the feed cable between your house and your shed?

A 10-3 cable will handle two allotments of 120 volts at 30 amperes. (Or one allotment of 240 volts at 30 amps, or any divvying up of that amount of watts between 120 volts and 240 volts.)

30 amps (10 gauge wire) already requires a subpanel and that may be big enough for a larger cable and more amps and more breakers. You can put two 20 amp subcircuits on a 30 amp 120 volt feed.

When you put in an upgraded feed cable to a detached building, you must take the older feed cable out of service. The new cable (to meet new codes) must have 4 conductors (hot, hot, neutral, ground) for 120/240 volts and 3 conductors for 120 volts only. Use 8 gauge copper for 40 amps and 6 gauge for 60 amps. (One size larger if the total distance from your main panel is great, I think more than 100 feet.)
Stick to your lawn watering schedule until it really starts to pour. After the storm you have only the same number of rest days you always had and then you need to start watering again.

Last edited by AllanJ; 08-28-2010 at 11:36 AM.
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Old 08-28-2010, 03:49 PM   #3
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Originally Posted by jstaub View Post
but not necessarily at the same time.
You may be OK. Change in brightness of incand. lamps is a sensitive indicator of this.
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Old 08-28-2010, 05:16 PM   #4
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I am not an electrician but i know it is important to have the right guage way for 30 amps..14 guage isn't enough...make sure you know what guage currently goes to your shed....make sure you have the right guage or you may have a fire hazard...usually the guage is printed on the sheath of the wire

Last edited by Aaroncarpet; 08-28-2010 at 05:30 PM.
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Old 08-29-2010, 04:48 AM   #5
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Need little more info here.

Conductor size which you have now { it should be able see the marking on the cable }

Distance from load centre to the shed in feet or meters

Numbers of exsting conductors in the shed now

Those few basic items that will really help us a bit to determed if the exsting one is large engouh to handle the addtional load or not.

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