IEC Standard Acceptable per NEC?

[cvirgil467]

I am intereted in using cast resin transformers (think GEOFOL) in the US. They do not have a UL listing but do have an IEC standard listing.

Does the National Electrcial code allow the use of IEC equipment (is IEC recognized as a qualified testing standard in the US)?

Thanks.
c

 

[jim dungar]

No.

IEC is not an independent testing agency. IEC is a set of standards that the manufacturer self-certifies to.

 

[zog]

For use in the USA most will need to meet the requirements of ANSI C57, IEC is generally used overseas.

 

[petersonra]

I am not sure what your question actually is.

You can use transformers made to IEC rather than NEMA (or whatever US) standards, if that is what you are asking.

I would point out that while in general transformers are not required to be listed, you might get some flack (from various sources) over using IEC style transformers and I seem to recall there are at least some cases where transformers are required to be listed.

I can't imagine why you would want to use an IEC transformer. Just getting one suitable for US electrical sources might well be an issue. You planning to have one shipped in from Europe or Asia? What possible benefit could you see in doing so?

 

[cvirgil467]

Cast resin transformers are much more compact than VPI or oil type of transformers which is the main reason why we are considering them. Cast resin type are starting to break into the US market and have been used overseas for a while now. I notcied that they are not UL listed or have not been tested to ANSI standards. I cannot locate anything in the NEC that would dis-allow their use. Is there text in the NEC that states electrical equipment is required to meet North American standards?

 

[jim dungar]

Cast resin type are starting to break into the US market

I sold my first 'built in the USA' cast resin transformer back in the early 80's.

What size transfromer and voltages are you thinking of?

 

[cvirgil467]

1000kVA.

 

[jim dungar]

1000kVA.

Major US manufacturers have been offering this size cast coil transformer for decades, in equipment built and tested to ANSI and UL standards.

 

[zog]

1000kVA.

Agree with Jim, nothing really new about them. I have several of those, all built and tested to ANSI standards. What voltages?

 

[cvirgil467]

This is cast resin, not cast coil type. There is a difference in construction. Check out Siemen's GEOFOL cast resin type of transformers.

 

[jim dungar]

This is cast resin, not cast coil type. There is a difference in construction. Check out Siemen's GEOFOL cast resin type of transformers.

The Siemens GEAFOL line of products seems to be identical to other cast coil and cast resin units, except for their use of 'aluminum foil' windings.

 

[zog]

This is cast resin, not cast coil type. There is a difference in construction. Check out Siemen's GEOFOL cast resin type of transformers.

Yes, cast resin, we make them, they are ANSI designed and tested. Up to 3000kVA.