This is from a google search.
The general rule of thumb for picking wiring size is
· 14-gauge wire is rated for currents up to 15 amps. Circuits in many
homes, especially cost-conscious tract homes, use 14-gauge wiring in most of
the house except the kitchen; even in the garage. This is a distinct
disadvantage nowadays due to hair dryers in bathrooms, computers and other
equipment in bedroom/home offices, etc. Avoid 14-gauge wiring in any new
home if you are building.
· 12-gauge wire for currents up to 20 amps. But a 20-amp breaker must
not be loaded above 16 amps of continuous current draw. This is adequate for
most home shops, provided your bigger tools operate on 240-volt power, and
you don't have multiple tools going at the same time.
· 10-gauge wire for up to 30 amps, or 40 amps if you are running
intermittently loaded motors such as on a table saw or jointer that is not
being used for big production jobs or jobs where you are doing a lot of
continuous cutting. With intermittent loads, you can use 40-amp breakers,
because a 40-amp breaker should not be loaded at more than 32 amps
continuous. Just be aware that you will have more heating in the wire, so it
be as open to ventilation as possible. It shouldn't be buried under the
insulation in an attic, for example, between the breaker panel and the plug
in the wall. 10-gauge wire is rarely used on 120-volt circuits.
> Want to replace current 10' cord with 25' cord.
> Is 14-3 large enough?
> Saw is 3 HP 220V. TIA, F
I'd buy a 25 ft, 10-2 /w/ ground molded cord set, chop off the
receptacle, wire it into the saw, get a beer and admire your handy work.
What you save buying the molded cord set pays for the beer.
Well, 12 would likely suffice very nicely, but 10 is better of course from a
heavy load viewpoint. Personally I'd probably just use a good extension
cord; all that cord might not be necessary someday and then you'd be looking
at cutting it off.
I'd go with 12-3. Some might recommend 10-3 but I don't believe it's
necessary or even beneficial for that length of run. 12-3 will be quite a
bit more manageable in size than 10-3. Just go buy an extension cord at the
local BORG, and chop off the receptacle end, and wire that end into your
Depends. If you are going to stay within the 25' then I'd go with 12 guage.
The surge of a starting motor draws more then you think. 10 guage would be
nice if you are even thinking of needing an extension cord. Either way, 14
guage is too small.
I know they wire houses with it, but 14 guage braided copper in a cord is
just not as safe for long distances.
You want to re-think that? I think you are mostly wrong!
Where did the 7.5 amps per wire come from??
Keep in mind that I deal with 220 single phase, 208 and 480 three phase on a
daily basis. I am sticking with my 20 gauge wire for the 25 foot run.
Hmm, OK, I see what you're at. I assumed the OP was a North American
residential, meaning opposing phases of the 110 make up the 220 and thus
each hot carries half of the total current rating. In the UK and other
places, their 240 is indeed going to carry all the current of the rating
since there is only one "hot" conductor plus the neutral.
But at the same time, 240 @ xx Amps, well, that's a different story.
Since the OP stated 220 and 15A, which is how NA power is stated, I suspect
he is in NA. But, your point is taken and valid if he's in a different
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