IEC 61000-3-2 applied at 120V and 100V

[DaveE]

Hi, I am working on a medical device being certified to IEC 60601-1-2 with two different models rated 120V (USA/Canada) and 100V (Japan). We would like to claim compliance with the IEC 61000-3-2 Harmonic Content sub-standard even though we are technically outside the 220V-240V rated voltage specified by 60601-1-2 section 7.2.1 and Table 2 note (b). Our NRTL is directly applying the limits in IEC 61000-3-2 Table 1 (Class A) which we do not meet...

My question - an online search turned up a user manual for a piece of harmonics test equipment (Yokogawa) containing the following equation for converting IEC 61000-3-2 limits for different mains voltages. Does anyone know the source of this conversion equation (e.g. an IEC / JIS / ANSI standard or otherwise) or other justification for using it?

Converted limit = ( IEC 61000-3-2 limit ) * 230 / ( Rated voltage of equipment )

I can't find much info on applying IEC 61000-3-2 to 120V equipment searching this forum or online, although it seems fairly common to do this...

 

[CharlieUK]

Why are you looking to comply with a requirement that doesn't exist
There's no requirement to test at 120V in table 1 and clause 7.2.1, so I wouldn't look to do a test against what would be a "made up" limit for a non-existent requirement.

 

[Jaydub]

We don't often do harmonic current emissions tests on voltges below 220 V in my lab. When we do we use Japanese limits that I think are from JIS-C 61000-3-2.