Is that credible? About 5.5 mΩ by my reckoning - i.e. about 3 metres of 25mm² to transformer, even if one assumes zero effective transformer impedance.
Kind Regards, John.
pscc of breakers
- Thread starter ncoups
- Start date
Kind Regards, John.
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Being that close to the transformer the reading is probably way out anyway (and see my earlier post)
Probably no to be honest.
My meter read 0.01Ω ohms for the phase to phase loop value, with an incomming voltage of 420V
(I have been a bit naughty and used a TP&N domestic supply here)
Yes, that was rather naughty (I had obviously assumed it was a 230V L-N loop) but I still very much doubt the credibility. How close was the transformer?Probably no to be honest. My meter read 0.01Ω ohms for the phase to phase loop value, with an incomming voltage of 420V (I have been a bit naughty and used a TP&N domestic supply here)
Kind Regards, John.
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I don't honestly know, but it certainly wasn't right next door.
Unfortunately I can't remember the earth loop reading but I'm sure it was pretty low, as we had a longish 25mm² SWA fed off 100A BS88 fuses and the loop was low enough to clear them.
Unfortunately I can't remember the earth loop reading but I'm sure it was pretty low, as we had a longish 25mm² SWA fed off 100A BS88 fuses and the loop was low enough to clear them.
I have had similar readings but only because the meter/leads were faulty.
In that case, it is surely well beyond credibility, isn't it, unless the supply cable was considerably greater than 25mm² - which seems pretty unlikely for a domestic installation!
Kindest Regards, John
The only possible explanation I would say - i.e. not a true reading!
Kind Regards, John.
My meter was within calibration at the time of the reading and has been calibrated two or three times since, and I've not to my knowledge had any other out of expected value readings from it.
I rather doubt that the calibrated range got anwhere near the figure you saw (does your calibration certificate give an indication of calibration ranges?)! In any event, if you're suggesting that you don't think it was a 'meter error', what other explanations have you considered?
Kind Regards, John.
Who knows?
Infact who really cares to be honest.
Infact who really cares to be honest.
Quite. I've already dismissed this one as beyond credibility. However, I continue to be interested in what sort of (credibleWho knows? Infact who really cares to be honest.
) high PFCs people sometimes see on domestic supplies.Kind Regards, John.
Does anyone know?
If a meter only gives values to two decimal places then would a reading of 0.01
represent an actual value of 0.0050 to 0.0149 or 0.0100 to 0.0199.
As the PSCC and PFC are merely calculated from the reading, at these values it would be quite meaningless, either way.
I know it doesn't really matter but I am just interested.
If a meter only gives values to two decimal places then would a reading of 0.01
represent an actual value of 0.0050 to 0.0149 or 0.0100 to 0.0199.
As the PSCC and PFC are merely calculated from the reading, at these values it would be quite meaningless, either way.
I know it doesn't really matter but I am just interested.
I obviously can't speak for yours, but all digital meters I've known or known about have rounded, not truncated - so, the first of those two options. However, it's quite likley that they use more significant figures for their calculations than they actually display.
Kind Regards, John.
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