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ridgid r4511, 13amp on 15amp circuit?

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Forum topic by Jeff posted 06-06-2010 06:40 AM 3397 views 0 times favorited 19 replies Add to Favorites Watch
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Jeff

10 posts in 2379 days


06-06-2010 06:40 AM

Topic tags/keywords: question tablesaw

Hello everyone!

So I’ve decided to get the ridgid r4511 but the largest circuit in my garage is 15a/120v. Should I have a 20am circuit installed?

I remember a friend doing our floors was cutting laminate on his ridgid r4510, but I’m sure it wasn’t drawing 15amps continuously. I was thinking maybe if I was cutting some maple or oak, the saw might draw 13amp from the circuit and the rule is that circuits shouldn’t be loaded more than 80% of their maximum rating, so should I be worried?


19 replies so far

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TopamaxSurvivor

17677 posts in 3143 days


#1 posted 06-06-2010 06:59 AM

Sounds like you already have a pretty good idea of what you should do:-)

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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CryptKeeper

132 posts in 2418 days


#2 posted 06-06-2010 07:00 AM

First, I’m not an electrician. There are a lot of variables at play here, motor rating and distance of the wiring run from the source to the consumption – basically you lose power of long runs.

It is not as simple as installing a new breaker you also have to look at the garages wiring. Most homes are wired using 14/2 wire which is rated for a max a 15amps. If you put a 20 amp breaker on 15 amp wire it could catch fire before it throws the breaker. For a new 20 amp circuit you would probably need new wiring using 12/2 or 12/3 if it is 220v.

I chose to install a 100amp sub panel for my garage / shop and give my TS a dedicated 30a/220v circuit. My tablesaw has 5hp motor and the manual called for 30a circuit.

-- Ron - Any day that I don't learn something new is a wasted day.

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a1Jim

115206 posts in 3044 days


#3 posted 06-06-2010 07:02 AM

If someone else used it you ought to be able to use yours

-- http://artisticwoodstudio.com Custom furniture

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MarkwithaK

370 posts in 2645 days


#4 posted 06-06-2010 07:05 AM

Will it burst into flames? No. While the 13 amps listed is the FLA rating I would look into upgrading that circuit….Depending on the wire gauge already used it may be as simple as replacing the breaker.

-- If at first you don't succeed then maybe skydiving isn't for you.

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Jeff

10 posts in 2379 days


#5 posted 06-06-2010 07:12 AM

Our panel is actually only a few feet away from that garage circuit under ground level. I would change it but I’d have to remove a lot of drywall and there’s a built in shelf on the side where the wire goes up to the garage so I’d have to take that down also.

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MarkwithaK

370 posts in 2645 days


#6 posted 06-06-2010 07:14 AM

Is the wiring in conduit?

-- If at first you don't succeed then maybe skydiving isn't for you.

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Jeff

10 posts in 2379 days


#7 posted 06-06-2010 07:19 AM

nah, the garage is attached to the house.

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CryptKeeper

132 posts in 2418 days


#8 posted 06-06-2010 07:26 AM

Can you tell what size wire you are dealing with?

-- Ron - Any day that I don't learn something new is a wasted day.

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MarkwithaK

370 posts in 2645 days


#9 posted 06-06-2010 07:32 AM

Also is there anything else on that particular circuit? I have this saw and before I rewired my garage it operated off of a 15 amp circuit that also powered pretty much everything else (think 1950’s backyard electrical) I would routinely blow that breaker even on soft maple….not to mention that the over all performance of the saw was lacking until I rewired.

-- If at first you don't succeed then maybe skydiving isn't for you.

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jsheaney

141 posts in 3456 days


#10 posted 06-06-2010 07:34 AM

I have a Bosch contractor saw on a 15 amp circuit. I generally don’t have a problem even with the shopvac on the same circuit. The only time I have trouble is when a lot of blade is buried in the workpiece, like resawing oak that’s too wide for the blade and has to be flipped for a second pass. In that case the breaker will trip. I can solve the problem by plugging the shopvac into another circuit for that operation. It’s been a really long time since that happened. In fact, I’m pretty sure I also had a box fan going at the same time. I moved that to a different circuit and I simply don’t have a problem anymore.

Most of the time, the TS is drawing much less than the maximum power.

Do not replace the breaker unless the wiring is sized for it. If it was sized for it, it would probably already have a 20 amp breaker.

-- Disappointment is an empty box full of expectation.

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MarkwithaK

370 posts in 2645 days


#11 posted 06-06-2010 07:35 AM

Not always. 12G THHN can support 20 amps and is pretty common….at least around here.

-- If at first you don't succeed then maybe skydiving isn't for you.

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Jeff

10 posts in 2379 days


#12 posted 06-06-2010 07:45 AM

well if the saw, say, does draw 13a, that’s over 80% of the circuits max load. Would it cause a problem? or is the 80% just a precaution?

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CryptKeeper

132 posts in 2418 days


#13 posted 06-06-2010 07:48 AM

In the section of the owners manual dealing with extension cords it states it’s calculations are based off of 12G wire with a 20 amp breaker.

-- Ron - Any day that I don't learn something new is a wasted day.

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vwmike99

23 posts in 3188 days


#14 posted 06-06-2010 11:07 AM

I have the 4511 saw on a 15 amp circuit in my garage which is also the same rating circuit in the rest of my one bedroom apartment. The breaker for two of my walls (which power my flatscreen tv, pc and microwave) trips several times a week (Contractor who built this place used cheap breakers and recepticles). Circuit is only 3 years old. I’ve yet to trip the garage’s 15 amp circuit using my table saw. I’ve cut 3/4 birch ply, 3/4 poplar, plastic and about 100’ of 2X4’s. I think if you just watch your feed rate of the hard woods, you’ll be fine. If you are a hobbist, why go through the trouble of rippin out drywall, and reduing the electrical? Unless you’re going to be running several pieces of equipment at once.

-- If I knew what I was doing, someone would be paying me to do it!

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uffitze

199 posts in 2422 days


#15 posted 06-06-2010 05:01 PM

The 80% rule is for continuous use.

About the only thing in a (small) shop that might be continuous use is the lights.

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