[Greenbuilding] Electromagnetic fields...!

[Bill Christensen]

Absolutely untrue.  EMFs are caused by direct *or* alternating current.
(If they weren't, DC motors wouldn't work!)

The magnetic field from DC is just as much magnetic, and as much a result
of the electric current (that's the "electro" part of it) as AC.

I agree that cell phone use is potentially worse than having PVs on your
roof.

There are simple things which can be done to reduce the effects of EMFs
from wiring.  Have you ever opened up a telephone wire or ethernet cable?
If you do you'll see that they're made of twisted pairs of wires, and those
pairs are also twisted around each other.  The EMF from the current going
one way in one of those wires tends to cancel out the EMF from the current
going the other way.  Ethernet cable has more twists per inch than telco
wire because ethernet systems are more susceptible to EMF interference.
(Both are DC, by the way).

Grounded sheilding can also reduce the effects of EMFs.  That's why COAX
cable is built the way it is.

On Fri, Jun 1, 2018 at 1:26 PM, Gordon Howell -- Howell Mayhew Engineering <
ghowell at hme.ca> wrote:

> Dan:
>
> Electromagnetic fields are only caused by alternating current.  Solar PV
> generates direct current, which has a functional frequency of 0.
>
> DC voltages have electric fields.  DC current has magnetic fields.  But
> these are not electromagnetic fields.
>
> If anyone has a big concern with any kind of electromagnetic field then
> the first thing they need to do is not use a cell phone, which, during
> phone call, emits large fields located right at their head.  If they use a
> cell phone then they are not serious in any concern about an
> electromagnetic field.
>
> +Gordon Howell
>
>
> Message: 3
>> Date: Fri, 1 Jun 2018 10:43:34 -0700
>> From: "Michael O'Brien" <obrien at hevanet.com>
>> To: Green Building <greenbuilding at lists.bioenergylists.org>
>> Subject: Re: [Greenbuilding] Photovoltaics and EMFs
>> Message-ID: <CF0598BE-185C-4D3D-AADE-623DDC1B0DEF at hevanet.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Hi, Dan?
>>
>> This issue comes up in the context of healthy homes. While I have met
>> individuals convinced they can sense and are affected by fields, there
>> isn?t much research on health effects of EMF from household or buildings
>> energy applications. What there is can be found on the National Institute
>> of Health web site. Research on high voltage transmission lines using sheep
>> who were penned under them didn?t find abnormalities.
>>
>> For me, the fact that EMF field strength falls off geometrically, with
>> the square of the distance, as it moves away from its source means humans
>> only encounter very low strength exposures.
>>
>> Best, Mike
>> Sent from my iPhone
>>
>> > On Jun 1, 2018, at 9:26 AM, Reuben Deumling <9watts at gmail.com> wrote:
>> >
>> > The Germans are in general way more concerned with EMFs than folks here
>> in North America, at least in my experience. Germany also has more PV than
>> just about anywhere, so right off I'd venture that run of the mill PV
>> doesn't seem likely to have EMF issues or the Germans would have raised a
>> ruckus.
>> >
>> >> On Friday, June 1, 2018, Antonioli Dan <solardan26 at gmail.com> wrote:
>> >> Someone recently told me that you shouldn?t put PV systems on roofs
>> because they produce a massive and unhealthy amount of EMFs that get into
>> your home. They heard this from a naturopathic doctor and were pretty much
>> convinced of it. I?ve done a casual search online for articles that would
>> address this but there?s not much and the test results seem inconclusive. I
>> pointed out that if they were concerned about EMFs they should consider all
>> of the AC wiring in their home and all of the appliances, etc. An electric
>> stove kicks out a lot of EMFs, but people tend to obsess over specific
>> things, like smart meters, etc.
>> >>
>> >> Has anyone researched PV and EMFs? Or measured it?
>>
> >>
> >> Dan Antonioli
> >> Laytonville Ecovillage
>
>
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