Good point.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
It all depends
On 2022-08-26 17:02, Don Gies wrote:
The cancellation that Mr. Woodgate points out could occur with
industrial equipment that was powered from North American 120/240 V
ac, 3-wire single phase or 240 Vac, single phase circuits (where there
are two line conductors separated in phase by 180 degrees on a
center-tapped, single-phase distribution transformer) or from 208 Vac,
single-phase equipment (where the two line conductors are separated
in phase by 120 degrees on a 3-phase distribution transformer).
If your market was strictly North America, you might use this to your
advantage. It is likely, though, that such equipment is sold on the
global market, so you might test for touch current with a 230 V,
single phase input (that is, 230V to earthed neutral). Then, no such
cancellation of touch current.
Best regards,
*Don Gies*
Internal
*From:*John Woodgate <[email protected]>
*Sent:* Thursday, August 25, 2022 3:32 PM
*To:* [email protected]
*Subject:* Re: [PSES] High Touch Current and GFCIs
[External email: Use caution with links and attachments]
------------------------------------------------------------------------
There is also a question in my mind as to whether there can be partial
cancellation of touch current. I suspect this is highly improbable in
the US, due to the distribution system ensuring that the neutral has a
very low voltage difference from the PEC. But in Europe, it's not
inconceivable that the neutral could be, say, 4.6 V relative to PEC
and the neutral-to-PEC capacitance 25 times that of L to PEC, so that
half the L-to-PEC leakage current is cancelled by the N to PEC current.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
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Rayleigh, Essex UK
It all depends
On 2022-08-25 19:12, Richard Nute wrote:
I wish to make two points:
1. Kirchoff’s Current Law states that the sum of currents
entering a node equals the sum of currents leaving the node.
The Law applies to summation of leakage (touch) currents
(e.g., through a 2,000-ohm resistor) and to summation of
protective conductor currents (through 0 ohms). In a power
strip protective grounding conductor, I’m assuming 0 ohms to
ground, so the current is slightly higher (1 to 10 % depending
on the leakage current limit and the voltage you are using) in
the protective grounding conductor than leakage (touch) current.
See IEC 60990 for touch (leakage) current and protective conductor
current measurement procedures.
2. A GFCI measures the current difference between line and
neutral conductors, not current in the protective conductor.
It nominally operates at 5 mA. We assume (with a reasonable
degree of accuracy) that leakage (touch) current is 100% of
the differential current measured by the GFCI. It is
possible, although unlikely, for some of the GFCI differential
current to find another return path than the protective
grounding conductor.
Best regards,
Rich
*From:* Lfresearch Jose
<[email protected]>
<mailto:[email protected]>
*Sent:* Wednesday, August 24, 2022 1:44 PM
*To:* [email protected]
*Subject:* Re: [PSES] High Touch Current and GFCIs
I have wondered about something similar.
If I use a 6 way power strip, I’m assuming all the leakage
currents for anything plugged in sum. Is that correct? I recall
getting a few trips when I used a power strip and It’s only just
twigged that might be why.
Cheers,
Derek.
Sent from my iPad
On Aug 24, 2022, at 3:27 PM, Brian Kunde
<[email protected]> wrote:
If I have a rake of electrical equipment with a single power
cord and a combined touch current exceeding 6mA, and I plug
the rake into a circuit with a GFCI, will it trip?
Thanks.
The Other Brian
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