will it fry or not

[jvolts]

My question is will my mm350p run on 100amp breaker( 230 volts,1 phase) or will it be cooked?

[barnett64]

100 amp is a little too big, Looks like the welder connected at 230 volt single phase should draw 61 amps at full output so you should have a 70 amp breaker.

[Bulldog]

To answer your question - well yes it will run on a 100 amp breaker. It just wont be protected the way that it should. Running on a 100 amp breaker will have no effect on the operation of the unit it just be protected as it should.
Bulldog

[fun4now]

i dont think i would worry about it being on a 100amp circuit as the 350 will protect itself internaly.;)

[Scott V]

Looks like the welder connected at 230 volt single phase should draw 61 amps at full output

That is more then likely at 300 amps output.
Full output at 400 amps probably sucks quite
a bit more. That is the dirty little secret about
inverters. When most of them get to full output
it really starts to even out with the rec.transformer
machines.

[barnett64]

i dont think i would worry about it being on a 100amp circuit as the 350 will protect itself internaly.;)
From a safety standpoint any electrial device should be installed with the proper size breaker or fuse. The internal protection is to protect from overheating. It will not protect the the building wiring if there is ever a short or grounded circuit in the welder.

Circuit breakers are really more about protecting the building from fire than protecting the welder. If a breaker is too large the welder input cord, the welder or the building wire can catch fire before the breaker trips. The circuit breakers in the welder will not protect the cord.

Just my thoughts on this.

Are there any eletricians that can better explain why to properly size breakers please?

[spotsineyes]

From a safety standpoint any electrial device should be installed with the proper size breaker or fuse. The internal protection is to protect from overheating. It will not protect the the building wiring if there is ever a short or grounded circuit in the welder.

Circuit breakers are really more about protecting the building from fire than protecting the welder. If a breaker is too large the welder input cord, the welder or the building wire can catch fire before the breaker trips. The circuit breakers in the welder will not protect the cord.

Just my thoughts on this.

Are there any eletricians that can better explain why to properly size breakers please?
You're absolutely right, Barnett. Circuit breakers are sized to protect building wiring, not to protect equipment.
I have to know this stuff for installing HVAC equipment, so I am qualified to answer at least this question.
So, two things: First, if you want a bigger breaker, you have to make sure that the wire in the conduit is either big enough, or upgraded to the correct size for the breaker you want to install, to avoid fire hazards.
Secondly, the concern of the breaker being too big comes into play only if the power cord's wire size is marginal.
Any equipment that relies on the circuit breaker for protection will list on its label Maximum Fuse Size.

[fun4now]

i would have replied earlyer but couldnt get on line, what i ment was the 100amp would be ok as i was asuming it was run with apropreate wire in the wall and like spotsineyes the circuit breaker is to protect the house not the welder the welder will do that. you only need to be concerned if you are trying to pull too much power threw the house wires not too little. by your thinking i couldnt have a 200amp main breaker to my house if i was only useing 100amps or the house will burn down. you can always upsize its trying to get by on too small a breaker thats a problem.;) when your electrition calculates the loads for you house wireing he figures how many light's can be run on the #14 wire, never expects them all to be on at one time but has to make shoure the wire and the breaker will handel it if they are, with some to spare. i supose if the cord its self were to short out it could catch fire without poping the breaker but odds are a short like that would still pop the 100amper, how large is the wire size on the MM350 ? if its rated for i would gess atleast 70amps as the welder is intended to cary 60+amps without any signifigant loss so a direct short would pop the 100 befor the wire lite up. if he only had a 200amp breaker i would say add a sub pannel to get it down to 100amps, but at 100 he will be fine.

[barnett64]

by your thinking i couldnt have a 200amp main breaker to my house if i was only useing 100amps or the house will burn down.

LMAO
thats some funny stuff right there!

[jvolts]

The wire on my mm350p is 6 awg and I think the wire is the same size on the main panel where the a 100 amp breaker is the main. would I be able to use 40amps breaker that is used by the range for my 350p? I think I've read some where where the recommended breaker is less than what is on the manual as long as the welder is'nt used on the full throttle.

[shadetreewelder]

The wire on my mm350p is 6 awg and I think the wire is the same size on the main panel where the a 100 amp breaker is the main. would I be able to use 40amps breaker that is used by the range for my 350p? I think I've read some where where the recommended breaker is less than what is on the manual as long as the welder is'nt used on the full throttle.
And what wrong with doing it the right way? You have a $3500 investment. Purchase a 70 time delay type breaker or a 90 normal acting breaker install some 8 AWG wire and have the set up properly done?

[spotsineyes]

Suggested Gauge vs. Breaker Amp
For Copper branch circuits and feeders.

Gauge Breaker Amps
14..............15
12..............20
10..............30
8................40
6................55
4................70
2................95
1/0.............150
2/0.............175
3/0.............200
Incoming Service Cable Sizing:

Gauge Breaker Amps
2-2-2..............100
40-40-20.........200
40-40-40.........200

[fun4now]

use the 100amp you have it will be fine. the MM350 has a 6gage wire thats 10 ft. if you are concerned get an electrition to come out and make shoure the wire in the wall is right for the breaker its atached to. if it checks out ok, you are fine. the only way you could possibly get a fire is if you droped a pice of steel directly on the power cord causing a short. and it should still kick the breaker befor that happens.
it will be about $60 to have a licenced electricion come out and look at the wire comming out of the breaker box to insure it is wired properly. best advice would be do that and put the isue to rest.;) after all you pay more than that every month for insurance, so protect your self and spend the $$ get an electrition. you will sleep better at night that way too.:cool: