I find this (that there must always be ground continuity across and
isolation transformer, and that one end of the secondary must be
connected to neutral) unlikely. There are at least five circumstances
in which this doesn't apply under UK regulations, and I am pretty sure
that the same
Dave,
An isolation transformer *does* isolate the neutral (and the hot), but
does *not* isolate the green wire ground - and for safety, it should not.
73,
Don W3FPR
David Woolley (E.L) wrote:
I find this (that there must always be ground continuity across and
isolation transformer, and that
On Sat, 27 Mar 2010 10:20:09 +, David Woolley (E.L) wrote:
I find this (that there must always be ground continuity across and
isolation transformer, and that one end of the secondary must be
connected to neutral) unlikely. There are at least five circumstances
in which this doesn't apply
On Sat, 27 Mar 2010 09:32:12 -0400, Don Wilhelm wrote:
An isolation transformer *does* isolate the neutral (and the hot),
NO! This is a summary of NEC (National Electric Code) requirements: The
NEUTRAL of a transformer on the secondary side MUST be bonded to the
equipment ground (steel
NO! This is a summary of NEC (National Electric Code)
requirements: The
NEUTRAL of a transformer on the secondary side MUST be
bonded to the
equipment ground (steel conduit, the green wire, building
structure, etc),
and that green wire must be carried from the breaker panel
to each
But Jim,
The secondary of an isolation transformer is fully isolated - i.e.
floating AC. The fact that the neutral of the transformer input side is
bonded to the green wire ground is quite a different thing. A proper
isolation transformer has no relationship to neutral on the secondary
side
On Sat, 27 Mar 2010 16:09:36 -0400, Tom W8JI wrote:
NO! This is a summary of NEC (National Electric Code)
requirements: The
NEUTRAL of a transformer on the secondary side MUST be
bonded to the
equipment ground (steel conduit, the green wire, building
structure, etc),
and that green wire
On Thu, 25 Mar 2010 08:23:52 -0700 (PDT), Wes Stewart wrote:
Also known as the, You can't get a static charge on a wet cat theory.
One thing is certain: you will have a devil of a time assembling a K3
with a wet cat tied to your wrist.
73,
Drew
AF2Z
On Wed, 24 Mar 2010 22:47:59 -0400, Don Wilhelm wrote:
Yes, the anti-static mat should be connected to ground - but there is no
need to go overboard on the grounding thing. A connection to the
grounding conductor (green wire ground) of the power distribution system
is more than adequate. You
I use the same one. The number is 276-2370. It's called an Anti-Static
Service Kit.
http://www.radioshack.com/product/index.jsp?productId=2102871
73, Mike NF4L
Don Cunningham wrote:
Chris,
I bought a very nice set from Radio Shack that contained a nice wrist strap
and the anti-static mat
We spray the chairs and lightly spray our clothes, including
shoes, with that anti-static anti-cling spray stuff they
sell at supermarkets for laundry and clothing called Static
Guard. It's in an orange and blue can. As a matter of fact
anyone doing any prototyping or repair or handling FET's
I would be *very* uncomfortable with a fully conducting
sheet of metal
on the top of my workbench - I even consider it dangerous.
I consider it deadly. I would never have a metal electronics
work desktop. It not only is dangerous to the worker, it is
dangerous to equipment.
We work on
Also known as the, You can't get a static charge on a wet cat theory.
--- On Thu, 3/25/10, Tom W8JI w...@w8ji.com wrote:
From: Tom W8JI w...@w8ji.com
Subject: Re: [Elecraft] (OT) Grounding Mat
To: Elecraft List elecraft@mailman.qth.net
Date: Thursday, March 25, 2010, 8:01 AM
We spray
I wear cotton clothes in the winter (when static is highest air driest).
For the assembly of the K3, I merely tied the anti-static mat to a
metal ground in the radio and wore a wrist strap attached to the
mat. If I had to leave the bench, I always put on the strap before
touching the radio
The text below sounds like the safest thing to me. I'll be
darned if I would strap my wrist to the ground pin of any
outlet in my house, whether it passed a test or not.
For the assembly of the K3, I merely tied the anti-static
mat to a
metal ground in the radio and wore a wrist strap
Gary Hvizdak wrote:
Wed Mar 24 22:14:20 EDT 2010 LS (W5QD) wrote ...
The mat doesn't have to be grounded ...
WARNING! The statement W5QD just posted is completely false! The ESD mat
must be grounded in order for it to be able to dissipate an electrical
The full reply from W5QD was
On Thu, 25 Mar 2010 10:03:42 -0800, Edward Cole wrote:
For some test equipment, isolation transformers should be used
because they ground circuits that you may not want grounded.
Aside from the fractured logic in this sentence, power isolation
transformers, installed per NEC, do NOT isolate
Does your grounding mat need to be grounded along with your wrist strap?
What type of grounding mat do you like best?
Thanks
Chris W7CTH
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
Chris,
I bought a very nice set from Radio Shack that contained a nice wrist strap
and the anti-static mat with a long ground lead for around $30. The wrist
strap has a bananna plug that plugs into a mount on the mat itself and from
that central point the ground wire (10' long) with an
yes, absolutely the grounding mat must be attached to a good ground, as well as
the alligator clip on the end of the coiled wire on your wrist strap.
I think almost any brand will do, as long as it clearly states on the label
that it is intended to prevent ESD (ElectroStatic Discharge).
For
: Lew Phelps K6LMP k6...@me.com
To: Elecraft elecraft@mailman.qth.net
Sent: Wed, March 24, 2010 7:53:20 PM
Subject: Re: [Elecraft] (OT) Grounding Mat
yes, absolutely the grounding mat must be attached to a good ground, as well as
the alligator clip on the end of the coiled wire on your wrist strap
The mat doesn't have to be grounded, but you, the rig, and anything else
that's going to touch the rig all have to be at the same electrical
potential at all times. So that generally means a wrist strap attached to
the mat for you and some way to attach your soldering station to the mat
also.
Wed Mar 24 22:14:20 EDT 2010 LS (W5QD) wrote ...
The mat doesn't have to be grounded ...
--
All,
WARNING! The statement W5QD just posted is completely false! The ESD mat
must be grounded in order for it to be able to dissipate an electrical
charge. If you don't ground the mat, then you
Lew and all,
I would be *very* uncomfortable with a fully conducting sheet of metal
on the top of my workbench - I even consider it dangerous. If I were to
touch that surface with one part of my body and accidentally touch a
source of voltage with another part, current will flow through my
My bench, located in a very dry and static ridden part of the country, does not
have a pure grounded mat... because of safety. If it, or the wrist strap were
at a solid ground, then the current capablity would be very high, and the only
resistance in the circuit. would be me. And, would
Gary, you are entirely correct.
There is ONE exception - that the anti-static mat is common to
everything. If one is standing on an anti-static mat that is connected
to the anti-static mat on the workbench, which is in turn connected to
the wrist strap, and that is also connected to every
WARNING! The statement W5QD just posted is completely false! The ESD mat
must be grounded in order for it to be able to dissipate an electrical
charge. If you don't ground the mat, then you might as well not have it,
since your entire work area could very easily be floating at tens of
24, 2010 8:47:59 PM
Subject: Re: [Elecraft] (OT) Grounding Mat
Lew and all,
I would be *very* uncomfortable with a fully conducting sheet of metal
on the top of my workbench - I even consider it dangerous. If I were to
touch that surface with one part of my body and accidentally touch a
source
All,
Another point worth considering about the fully conducting work surface
is that it can actually damage components just as easily as no
anti-static mat at all.
If the component already has a charge, when it is placed on that fully
conducting surface, the discharge will be instantaneous,
Amen, Don. Plus, in dry climates like mine the body accumulates enough
static electricity in a matter of seconds to cause an annoying little shock
when touching real metal. I use the anti-static mat frequently to discharge
myself whenever I get out of my chair and before touching metal!
/Rick
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