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Wiring welder in the Philippines? ( 3 wire to 2 wire ) Answered

aI have a millermatic 211 which is a multi-voltage welder which I will be bringing to the Philippines.

The adapter plugs are 5-15p (120v), and 6-50p (230v).

Philippine electricity mains when I live are 220v single leg, with neutral.
I am adding ground to both the Main panel and sub panel when I arrive, as most residential homes with a 2 wire system do not have them installed.

According to the welder schematic  6-50p adapter configuration shows white, red, and green (ground) so goingfFrom a 3 wire US to 2 wire Philippine system is it proper to wire L1 to red, neutral to white and green to ground?

6-50 receptacle does not seem to incorporate a ground in typical installations????


Jack A Lopez

2 years ago

The pictures you have upped look like page 36 of the manual for your welder, and if anyone reading this wants to see a pdf copy of this manual, I found one here:


Also the product page for this welder, Millermatic 211, is here,


If you wanted to, you could probably ask this question to someone at millerwelds.com via their "contact us" form,


The colors used on page 36 of the manual, the pictures you upped, suggest the colors they are using are:

green = ground = G

black = neutral = N

red = line1 = L1

white = line2 = L2

and those are the {G,N, L1, L2} found in US mains power, where L1 and L2 are both 110 VAC, but 180 degrees out of phase, so that the potential difference between L1 and L2 is 220 VAC. After all, NEMA is a US standard. Which reminds me, the Wikipedia page for "NEMA connector"



has a picture that includes NEMA 6-50, and that connector has three nodes (wires), specifically ground (G) and L1 and L2.

Regarding your question,

"6-50 receptacle does not seem to incorporate a ground in typical installations????"

the NEMA 6-50 outlet does have a ground. What it does not have, is a neutral (N).

As you say, in the Philippines, the mains power comes with just one L, and the voltage on it is 220 VAC, with respect to N.

The red and white wires of the welder would normally see a voltage difference of 220 VAC, so what you suggest: line to red and white to neutral, that seems like a good guess. It might also work with those reversed, i.e. line to white and neutral to red.

When you first try it out, I would suggest not connecting the ground conductor. Just see if you can get it to work (i.e. try some test welds) with just two wires, namely the red and white wires in the diagram, from page 36.

I mean, the ground wire is there for safety reasons. Under normal circumstances, no current flows through the ground wire. It is there in case something breaks inside the machine, and a a wire comes loose and touches the inside of metal case of the machine.

I don't know how this welder is wired with respect to its ground wire. Maybe it is just connected to the metal case, and the case is not connected to anything else.

Anyway, for some reason I feel kind of superstitious about this machine's ground conductor, and I would connect that part last, and maybe check with a meter first to make sure it has no potential relative to the ground wire of your Philippines mains power.

Antonioo35Jack A Lopez

Answer 2 years ago

By the way, a Facilites Plant technician, i know at work, told me the Pitch Fork GROUND SYMBOL means it is chassis grounded.

Jack A LopezAntonioo35

Answer 2 years ago

Yeah. That is what the diagram suggests. The ground wire from the mains gets connected to the chassis, and that's the only thing it is connected to, hopefully.

I've never met any FPTs, but they sound like good people.

Antonioo35Jack A Lopez

Answer 2 years ago

Thank for the informative answer, I appreciate your time and effort. I will comprehend your answer a little more after reading it several times, and as Steveastouk answered as well, the welder is double insulated. I will check my welder to see if it is case grounded.

I am be cautious as can be when dealing with the misunderstood Philippine wiring system.


2 years ago

220V single leg is how most of the rest of the world is wired. The US system of 110-0-110 is an anomaly.

Your 6-50 plans sound right. The green is the ground wire, and the connector is normally grounded on the centre, round pin.

The double pole isolation in the input power will be fine in the Phillipines too.


Answer 2 years ago

Yes thank you...i do agree America stands apart in a lot of things and makes it difficult to transform from one method to another.