Re: Experience with Magnetic Shielding?

[Guest guest]

Magnetic shielding tends to be too expensive to use on a whole house.

You can't use aluminum foil, but mu-metal foil will make an improvement.

The most cost effective is silicon steel (magnet steel). It's not a foil,

it is sheet metal. The grain of the metal should align with the field.

From 10mG you have a long way to go. Even to get a small area down to 2mG

would be a challenge, and ideally you want 0.02 mG or lower.

If it's coming from a power line it's pretty hopeless, although getting rid

of neutral current and ground loops can allow the field to fall off more

quickly as you move away from the lines. This means interrupting current in

metal water pipes, disconnecting extra ground connections, gas to electric

connections. It's good to figure out where current flows in the

neighborhood before hring a plumber.

On Sat, Jan 1, 2011 at 2:35 AM, ChrisR <vwporscheaudi@...> wrote:

>

>

> Hi Guys! New to the group, and one of the many topics I hope to learn more

> about is shielding magnetic fields. Im close to the main line to the house,

> and the panel box in the bedroom. I would like to use some kind of foil or

> other material to line outside the house wall, and panel to block some of

> the magnetic entering through the wall. I hope someone has heard about this

> before. Im getting a 10mg reading or higher sometimes!

>

> Thanks guys.

>

>

>

[Guest guest]

Hi Bill. Thanks for your response. I will look into the silicon steel more, as

this may be a little cheaper than all this mu-metal ive been looking at!

My issue continued: I have the power " drop-down " coming into my roof and going

on the opposite wall of my shower and bedroom. the box is pretty much next to

my head when I shower, and the highest readings.

I want to put a piece of shield(silicon steel?) in between the back of the panel

box, and the shingles on my house. its a small distance, maybe 1 " , but anything

I can pack in that distance is best.

Is there a wrap or conduit that is good to wrap around the power lines? (of

course with power company approval)

thanks.

p.s. as far as checking current to ground in the neighborhood, can you

elaborate? get a net current flow meter and walk to my neighbors houses putting

it around the water/gas/ground lines?

would the catv line near the power line amplify the magnetic field?

>

> >

> >

> > Hi Guys! New to the group, and one of the many topics I hope to learn more

> > about is shielding magnetic fields. Im close to the main line to the house,

> > and the panel box in the bedroom. I would like to use some kind of foil or

> > other material to line outside the house wall, and panel to block some of

> > the magnetic entering through the wall. I hope someone has heard about this

> > before. Im getting a 10mg reading or higher sometimes!

> >

> > Thanks guys.

> >

> >

> >

>

>

>

[Guest guest]

Thanks for the responses.

To add to this matter, I have recently found that before my CATV cable is

grounded at the meter tube close to my bedroom, that I have high gauss readings!

I believe this to be my issue, or at least half of it. The CATV coaxial cable

drapes close to my bedroom windows, close than the actual power lines by about 5

feet.

I have called the cable company and told them my issue. The last guy was scared

to climb on a ladder to install some cables, will see how the pressure increases

what happens haha. I believe there to be some power on the CATV lines... if

anything, im getting it re-routed, which is much easier than power feeds.

I have also noticed high readings from the neighbors property. They have a old

style knob and tube from the lines to there house going close by my room. This

is really old style, and seems like a ionizer at this point...

Anywho, thats the update.

Thanks again, and I will try to help my best back in the group!

All the best.

> > >

> > > >

> > > >

> > > > Hi Guys! New to the group, and one of the many topics I hope to learn

> > more

> > > > about is shielding magnetic fields. Im close to the main line to the

> > house,

> > > > and the panel box in the bedroom. I would like to use some kind of foil

> > or

> > > > other material to line outside the house wall, and panel to block some

> > of

> > > > the magnetic entering through the wall. I hope someone has heard about

> > this

> > > > before. Im getting a 10mg reading or higher sometimes!

> > > >

> > > > Thanks guys.

> > > >

> > > >

> > > >

> > >

> > >

> > >

[Guest guest]

I had a cable guy come out to check it out. He was overwhelmed, but will return

next week to do some changes with another helper. Quite understanding at least

at this point...

Bruno, it looks like I have a couple options:

1. move ground out to property line, and ground shielded catv line before coming

into my area.

2. install a spark gap?

3. install a transient voltage surpressor?

the last two i researched and still couldnt find much info on the stuff. is it

similar to a ground loop isolator? I read about those on one website breifly...

Thanks!

> > > > >

> > > > > >

> > > > > >

> > > > > > Hi Guys! New to the group, and one of the many topics I hope to

> > learn

> > > > more

> > > > > > about is shielding magnetic fields. Im close to the main line to

> > the

> > > > house,

> > > > > > and the panel box in the bedroom. I would like to use some kind of

> > foil

> > > > or

> > > > > > other material to line outside the house wall, and panel to block

> > some

> > > > of

> > > > > > the magnetic entering through the wall. I hope someone has heard

> > about

> > > > this

> > > > > > before. Im getting a 10mg reading or higher sometimes!

> > > > > >

> > > > > > Thanks guys.

> > > > > >

> > > > > >

> > > > > >

> > > > >

> > > > >

> > > > >