Electricalhelp
Senior Member
- Location
- NJ
Wiring Diagram
- Thread starter Electricalhelp
- Start date
- Status
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
If they have some need to isolate the neutral, it’s permissible so long as both poles of the circuit breaker open simultaneously.
From a strict technical standpoint though, there is no immediately obvious need to switch the neutral though on a 120V load. If this is on something that came from another country, it’s somewhat common for people unfamiliar with our systems to make unnecessary designs like this.
But the important people to ask are those who made it.
From a strict technical standpoint though, there is no immediately obvious need to switch the neutral though on a 120V load. If this is on something that came from another country, it’s somewhat common for people unfamiliar with our systems to make unnecessary designs like this.
But the important people to ask are those who made it.
Electricalhelp
Senior Member
- Location
- NJ
The equipment is from the US.
So I assume 120V/1P will work
So I assume 120V/1P will work
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
The fact that it uses the letter E for ground suggests a foreign origin, as does the odd styling of the drawing itself, although it could have been done by somebody unfamiliar with US electrical standards. None of which bodes well to me.
Who would say 110/240 volts?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
It says 2 pole so I would say 240. The fact that they used 110 as a voltage indicates that they're unfamiliar with 120/240.
4-20mA
an analog man in a digital world
- Location
- Charleston SC
- Occupation
- Instrumentation & Electrical
Maybe the equipment can be tapped 120 or 240 and is selectable? Just spitballin' here...
I'd wire it for 240 if it were me doing the job.
I'd wire it for 240 if it were me doing the job.
Tulsa Electrician
Senior Member
- Location
- Tulsa
- Occupation
- Electrician
What type of load?
I would like to see a pic of the whole drawing. Like to see where those dotted lines go.
It does appear to be double fed 120 volt load.
It may require a two pole switch/ ocd if dual feed.
I would like to see a pic of the whole drawing. Like to see where those dotted lines go.
It does appear to be double fed 120 volt load.
It may require a two pole switch/ ocd if dual feed.
Electricalhelp
Senior Member
- Location
- NJ
I would put the rest of the drawing but I don't think I have permission from the franchise
- Location
- New Jersey
- Occupation
- Journeyman Electrician
You won't get a definitive answer based on what depicted in the OP.
Rangemaster
Member
- Location
- Nevada
- Occupation
- Electrical Contractor
Looks like a 2-pole 120v breaker with a switched neutral.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Possibly a fuel dispensor that requires a switched neutral
Another C10
Electrical Contractor 1987 - present
- Location
- Southern Cal
- Occupation
- Electrician NEC 2020
Another C10
Electrical Contractor 1987 - present
- Location
- Southern Cal
- Occupation
- Electrician NEC 2020
It would work but it would draw more amps to operate.
JoeStillman
Senior Member
- Location
- West Chester, PA
Looks like a ground isolation system such as you'd have in a hospital OR.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
It’s not 240V because it shows one line as Neutral. It also specifically says the source is 110V 60Hz.
I agree that this drawing was done by someone unfamiliar with North American standards. “E” for “Earth” instead of “G /Ground” is a dead giveaway, as is the use of the term “Mains” and “110V” for that matter.
Because of this I wouldn’t pay any attention to the “120/240V” notation as anything but a reference to the rating of the circuit breaker. I’d take that to mean you can use a 2 pole 120/240 (aka “slash”) rated breaker, as opposed to a “straight” 240V rated breaker, a superfluous detail most of us would not have needed.
I agree that this drawing was done by someone unfamiliar with North American standards. “E” for “Earth” instead of “G /Ground” is a dead giveaway, as is the use of the term “Mains” and “110V” for that matter.
Because of this I wouldn’t pay any attention to the “120/240V” notation as anything but a reference to the rating of the circuit breaker. I’d take that to mean you can use a 2 pole 120/240 (aka “slash”) rated breaker, as opposed to a “straight” 240V rated breaker, a superfluous detail most of us would not have needed.
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