using a transformer to separate your gear power

I find myself commenting here on a rumor that balanced power is on its way out in the US.

This is patent nonsense.

In 1996, Article 530 Part "G" was adopted in the National Electrical Code by the members of Technical Panel #15 which includes representation from literally every segment of the electrical industry including electrical inspectors, chief electrical engineers of large corporations such as Universal Studios, manufacturers, IBEW Union representatives and a host of other electrical authorities.

In the most recent edition of the 2002 National Electrical Code, Article 530 Part "G" was superceded by a new article dedicated soly to the implementation of balanced power. The committee felt that its place deserved an article of its own in the codebook. That would be Article 647. The primary difference between the former text and the current version is that the scope of balanced power has been widened to include ANY sensitive electronic apparatus, not only sound and video equipment.

This doesn't sound to me like anyone is going to ban anything. Rather, it is quickly becoming the electrical industry standard for applying power to sensitive electronics of any type.

I hope this straightens out any confusion.

Thanks for the space.

Martin Glasband
President, Equi=Tech Corporation
Author Article 530 Part "G" 1996, 1999 NEC
Author Article 647 2002 NEC

Rives: 6.5 KVA ??? Now THAT is a transformer. Only problem is that you'd need one HELLUVA circuit feeding it in order to tax its' capabilities : )

Martin: Thanks for responding. While we've got you here, can you clarify something for me ? If a noise source is generating interference into both sides of the AC line in equal amplitude and phase, will "going balanced" filter that out ? I think i already know the answer but would like to get input from someone that specializes in this field. Sean
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Sean: As I said it was for a medical device (an x-ray unit). This is actually a small transformer for an x-ray unit. I did use a 220 v 30 amp line to feed into it and then had 110 v with four separate circuits and filters. 2 were 15 amp and 2 were 20 amp. Obviously, the equipment did not draw all that or it would have caused the 220 v 30 amp circuit breaker to go.

I have a 1KVA low-tech coil isolation transformer, weighted 35 lbs.

My experience is that the IT does expand the soundstage and helps the seperation of instrument. The bass can reach lower and highs are significantly smoother on my system. The overall sound is certainly clean and pleasant.

The only drawback I found on traditional IT is the slow response. When I watch those booming movies such as "Pearl Harbor" , I notice the bomb's full explosion was just a bit staggered than usually. This may be due to the fact that the transformer need a bit more time to 'transform' large power from the input to the output.

My amp consumes about 400W and the 1kVA transformer should be well beyond the amp's quest for power, but it does not seem that way.

Now I unplug the IT when I watch movies and put it back when I listen to strings and vocals.

Isolation transformers should have a 20:1 ratio to work properly which is why we generally recommend them for digital components, televisions or pre's. As an example your IT should be rated at 8kVA to avoid transformer saturation. I may be in overkill mode but, better safe than losing dynamics.