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
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]>
*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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