EMF's due to dry type transformer

[mshields]

I'm going to have a 500kVA transformer against a wall on the other side of which will be work stations. i.e. computers. To eliminate any concerns for EMF interference of those machines, I know that I can put a steel plate on the wall but what I don't are the particulars. e.g.

1. This is a new space, would you build this into the wall?
2. if the transformer is 4 feet wide, how much larger would the plate width need to be (if in fact it had to be wider than the tranformer.
3. Same question for height of the steel plate
4. How about thickness of the plate?

Appreciate your input.

Thanks,

Mike

 

[hurk27]

Metal plates do not always block EMF at 60 hz, put a magnet on a piece of steal or aluminum and then stick something to the other side, it will still stick to it, common core transformers should produce very little EMF which does not travel very far from it and are already encased in a metal case.
EMF is canceled by having all the circuit conductors in close proximity with each other, place a single conductor in a metal conduit and put a load on it and you will still have EMF outside of that conduit, a common core transformer that has all the circuit conductors to it and away from it will cancel out almost all the EMF once you get just a few feet away from it, someone had a chart showing this a while back that was posted here, maybe I can try to find it.

Allot of this EMF at transformers hype comes from single core transformers, because they are sepertated and will produce a higher EMF foot print.

While on the other note, CRT type monitors can have a problem with high EMF levels, most computers today will have LCD type monitors and are not affected.

 

[brian john]

I just finished a transformer EMF issue, They spent a bundle plating, shielding and relocating minimally. Issue was not resolved to the tenants satisfaction. I was there only to measure, thank goodness.

If you name is going on this and it is a mandatory spec to meet a certain level. Hire an EMF specialist to design the shield.