Magnetic radiation testing

[kerching]

Never been asked this one before; so I thought I would throw myself in at the deep end.

A Surveyor friend of mine has been asked about the Magnetic Field emitted from a UU Substation. His client is about to purchase a Flat which is some 30 feet from the Sub and he is concerned about growing extra limbs etc. In the past there have been issues with HV overhead lines etc, just wondered aboout Subs and also, who would you get to test such a thing????............. :coat

---------- Post Auto-Merged at 10:27 ---------- Previous post was made at 10:26 ----------

Never been asked this one before; so I thought I would throw myself in at the deep end.A Surveyor friend of mine has been asked about the Magnetic Field emitted from a UU Substation. His client is about to purchase a Flat which is some 30 feet from the Sub and he is concerned about growing extra limbs etc. In the past there have been issues with HV overhead lines etc, just wondered aboout Subs and also, who would you get to test such a thing????............. :coat

I have put Sub but it may be just a 1KV transformer

 

[Apache]

 

[kerching]

I did actually think that!!

I may just advise the fitting of a Retro Encabulator, and be done with it...simples:coat

 

[ProDave]

I recall a television program about this a while back, and what a farce it was.

The guy had picked a house under a HV pylon, and was wandering about the property with an EM field meter.

He picked up on the fact the highest reading was at the headboard of the bed in the main bedroom, and kept spouting on about what a bad place that was to sleep blah blah.

Then he went around to the other side of the wall, and there immediately the other side of the wall to the bed, was the CU and meter.

What I learned from that was you will get a much much higher EM radiation from your own internal wiring, than you are ever likely to see from a substation or nearby pylon, so don't worry about it.

Of course that was not what the program was trying to convey.

 

[Manator]

The units used to measure magnetic fields is microtesla, inside a modern substation readings will probably be no more than around 10 microtesla, this would reduce to about 3 microtesla after a range of only 2m.

Your electric shaver will probably produce about 500 microtesla, and your hairdryer about 1500 microtesla.

I would not even go to the trouble of doing any measurements, and it would have to be carried out by specialist testers, which most of us do not have.

The reason magnetic fields have been investigated so much is because of scare stories in the press that suggested a link with power lines and substations to leukemia.

If the prospective owner of the flat wants to prevent any disturbance, move all his electrical equipment out side, and move the flat nearer to the substation. He will receive more radiated magnetic fields turning his TV on than living inside the substation.

 

[Evans Electric]

I imagine that the metal swichgear cases would reduce the radiation considerably.

I'll just mention an earlier post of mine where I had a problem with the fluxes around 200A meter tails at a printers.

It was noticed that a computer monitor had interference on it when placed by a 10 inch thick blockwork wall in their studio. The mains incommer was the other side of the wall where I had recently fitted new 70mm tails but in my (mistaken) wisdom I had ty-wrapped them to the tray in a flat formation with about 25mm between them , thinking that any heat would dissipate better .

The interference was in a 3mtr radius of the tails , which were about 3m long.

The radiation was reduced to almost zero by re-clipping the tails in trefoil formation .

 

[revjames]

I worked in an aluminium smelter for 12 years. 132KV switchgear, 170000A running through busbars at 700V DC creating massive magnetic fields. I asked a guy who had been there from day 1 (40 years) if the magnetism had affected him. He replied that the only thing he had noticed was when he went to bed he always ended up pointing N-S....

 

[Manator]

ROTFWL :slap :slap:slap

 

[batty]

Take it the client doesn't have a mobile then?

 

[revjames]

You werent allowed in the potrooms if you had a pacemaker. There was also a bloke with a metal plate in his head and we would often have to prise him off the busbars with a bronze crowbar! ... maybe not but would have been funny. Our mess room was right in between 2 of the 4 potrooms and I would sometimes take a cooked meal in to microwave for lunch. One day my missus noticed the knife nad fork were magnetised and stuck together when she took them out of my lunch bag!

Batty I thought phones were microwave radiation?