Read Chapter 31
To give a flavor of the material contained in Silencing
the Fields, six chapters are given here, ranging from basic
material, to other material that is more difficult and may not
be familiar even to the expert.
(These chapters are copyrighted, but a chapter-length or
less may be quoted or reproduced without advance permission,
provided the source, Silencing the Fields by Ed Leeper, and
this web address, silencingthefields.com, are mentioned.)
Doing a "Water Line Job"
It is explained on another page of this site, under Field Production by Water
Line Currents, how the flow of electric current into a metallic
city water system can cause high fields in a house, and how
relocating the "service wires" that bring power to a house may
help us dodge some of the fields produced.
But sometimes water-line-current fields can be more
completely eliminated by blocking the current's all-metal path
to the water main. Chapter 31, given here, explains how.
Further chapters in Silencing the Fields outline some drawbacks
of cost or safety -- while co-author Stewart Maurer provides a
chapter with a different viewpoint on these concerns. In
addition, appendices give instructions for the electrician and
plumber who perform such a water line job.
(Note that a new Appendix 5 is now inserted that describes a
kind of grounding usable in new construction that somewhat defuses this
conflict between safety and low fields.)
Fields from Electric Blankets
In the past, a large source of magnetic field exposure
for many people was the use of an older type of electric
blanket that is no longer sold -- but many of which are still
in use. Newer blankets generally produce lower fields.
Read Chapter 93
Also discussed in Silencing the Fields are fields from
other appliances -- ranging from hair dryers to electric
shavers to TV sets to conventional computer monitors. In many
cases, including flat-screen LCD computer monitors, fields have
changed substantially as appliances are
redesigned. Doing one's own appliance measurements may be
Balancing Power Company Primary Lines
Part V (34 pages) of Silencing the Fields describes the
various ways that power company neighborhood distribution
wiring may produce fields. As always, "net currents" on these
lines are an important factor.
One way that such net currents may arise is where a
"primary line," one of the medium-high-voltage lines that comes
from a substation to supply the neighborhood transformers, has
an "unbalanced load" (because one of the three phase wires
serves more than its share of transformers). If such a net
current exists (which we can determine), the remedy by
"rebalancing" may be far less expensive than others, such as
moving the line. And balancing the load on a three-phase line
is something a power company tries to do anyway, for
In dealing with your power company, it helps to know where
they are coming from, and what constraints (mainly financial)
they have to work with.
Read Chapter 65
Household Wiring Defects
A homeowner has somewhat more control over reducing those fields
generated inside the house (if such problems exist, as they
Part IV (40 pages) of Silencing the Fields deals with the
various ways that field-producing "net current loops" can arise
within a house -- and how they can be diagnosed and corrected,
with a minimum of expensive electrician's time.
"Subpanel grounding errors" are an important category of
such wiring mistakes, and they create characteristic fields
that a homeowner can spot. But although some subpanel errors
are obvious ones, easy for an electrician to find and remedy,
when requested, other errors or defects that involve a subpanel
can be more elusive, because the actual mistake is elsewhere,
on one of the circuits served from the subpanel -- perhaps
inside a wall. This can and does get complex.
Read Chapter 54
What Field Level is Safe?
A commonly-asked question is what a "safe level" is for AC
magnetic fields at a house (i.e. for the average of fields seen
throughout the house - since "hot spots" near certain plumbing
pipes and wires are almost always much higher). But for
various reasons, that health effects question is extremely
difficult to answer with any certainty and clarity.
Silencing the Fields does not try to provide such an
answer - except to suggest a simpler, more pragmatic approach
that asks instead whether fields at a house are unusually high.
In a way, taking such an approach recognizes implicitly that
any degree of risk yet observed by the health effects research
is fairly small (compared with some other risks we may take in
our lives); but it also recognizes the fact that field
reductions may prove easy and inexpensive to achieve, in many
Read Chapters 4 and 5
See also another page of this site The Question of Risk
Hunting For a Low-Field House
If one is concerned about the possible health effects of
high magnetic fields, looking for a house with low fields (to
buy or rent) can present a problem. If one is rushed, this can
be hectic - especially if one first confronts the issue of
fields only after one is already actively house-hunting.
Perhaps one has already located a desirable house at a good
price, but noticed that it looks as if it might have high
fields, perhaps because of nearby power lines.
Note that looking for a low-field house is quite difficult
unless one can buy or borrow an AC magnetic field meter (even
the most inexpensive are better than none). Also note that the
proximity of a power company transformer is no longer a
reliable indicator for the presence of high magnetic fields,
except very close to a ground-level transformer.
Read Chapter 7