Dealing with European equipment

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circuitrider

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I have European equipment that is rated 240V, single phase, 50Hz/60Hz. The equipment itself has a 2-pole breaker, one for "L" and one for "N." My transformer is a 240V ungrounded delta. Is there anything in the NEC that tells me whether I can connect "N" to a voltage that is not neutral, or do I need to use an isolation transformer to be legal?
 
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circuitrider said:
I have European equipment that is rated 240V, single phase, 50Hz/60Hz. The equipment itself has a 2-pole breaker, one for "L" and one for "N." My transformer is a 240V ungrounded delta. Is there anything in the NEC that tells me whether I can connect "N" to a voltage that is not neutral, or do I need to use an isolation transformer to be legal?
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Check with the manufacturer. Some equipment is grounded-conductor agnostic, and some equipment may require one of its power feed conductors to connect to the grounded conductor.
 
Carultch said:
Check with the manufacturer. Some equipment is grounded-conductor agnostic, and some equipment may require one of its power feed conductors to connect to the grounded conductor.
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Getting a European manufacturer to understand an American concern is not always easy. It sounds like I will need the isolation transformer single phase, grounded on one end, with a sign warning the electrician that the equipment and voltage are non-standard.
 
Besoeker said:
And Vikki Verki...............:)
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I worked with an interpreter and a technician that a business had flown in to repair a machine we were struggling with one time.
After about an hour in I said,,,,, SHEEN SCREWED WEE ?? he replied, WEE WEE SHEEN SCREWED, SHEEN SCREWED... :lol:

JAP>
 
circuitrider said:
Getting a European manufacturer to understand an American concern is not always easy. It sounds like I will need the isolation transformer single phase, grounded on one end, with a sign warning the electrician that the equipment and voltage are non-standard.
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How are you going to bond your SDS?
 
electrofelon said:
See 250.30
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I've read it, but I'm not following you. (There are several parts to the section.)

Just to review, I'm coming off of a 240V delta, but I need 240V to neutral and I'm using a single phase transformer to accomplish this. It seems straightforward to me that it would work functionally. It might not be code legal, but I need help understanding why. [I also recognize that it needs a bonding jumper, if that's the issue.]

Thanks.
 
circuitrider said:
I've read it, but I'm not following you. (There are several parts to the section.)

Just to review, I'm coming off of a 240V delta, but I need 240V to neutral and I'm using a single phase transformer to accomplish this. It seems straightforward to me that it would work functionally. It might not be code legal, but I need help understanding why. [I also recognize that it needs a bonding jumper, if that's the issue.]

Thanks.
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An SDS requires a grounding electrode system.
 
I may have misunderstood what you were proposing. So you have a single phase 240 to 240 transformer? it would be unconventional, but I see no issue with making one of the secondaries a grounded conductor. You would connect that terminal, the gec, the supply egc, load gec, and a bonding jumper to the tranny case all common. You would have a white, black, and green to supply the load with 240 between white and black. In this case you could protect the secondary conductors with the primary ocpd. Also you could skip secondary protection of the transformer if your primary protection is not over 125%
 
iwire said:
An SDS requires a grounding electrode system.
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Yes of course, and I have that covered. (Poor explanation on my part.)

electrofelon said:
I may have misunderstood what you were proposing. So you have a single phase 240 to 240 transformer? it would be unconventional, but I see no issue with making one of the secondaries a grounded conductor. You would connect that terminal, the gec, the supply egc, load gec, and a bonding jumper to the tranny case all common. You would have a white, black, and green to supply the load with 240 between white and black. In this case you could protect the secondary conductors with the primary ocpd. Also you could skip secondary protection of the transformer if your primary protection is not over 125%
Click to expand...
Great, thanks guys!
 
circuitrider said:
I have European equipment that is rated 240V, single phase, 50Hz/60Hz. The equipment itself has a 2-pole breaker, one for "L" and one for "N." My transformer is a 240V ungrounded delta. Is there anything in the NEC that tells me whether I can connect "N" to a voltage that is not neutral, or do I need to use an isolation transformer to be legal?
Click to expand...

Did the device come with a plug? Is it a Schuko German style plug (two round prongs and two metal strips 90 degrees from the plugs on the side of the plug). If so the device is neutral agnositic since that style of plug is not polarized (for neutral/hot).
 
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