B
Bobster
If suggest higher than 10ka rated mcbs if the pfc was measured at 10ka.
E
Engineer54
Just looked at that model, ...and yep, that'll do the trick!! ...lol!!
How much did the tester cost in the UK??
D
Darkwood
Was a minimum suggestion as he said 10k not higher.... as its domestic most common brands are 6k or 10k ratings ....if he had said 11k 12k etc then yes i would obviously have suggested mcb's for such but its only a recommendation as he's not required to fit them anyway.
B
Bobster
Darkwood I know you know that, I was just pointed it out to those who are still green.
E54 think the company paid £400 is for it maybe a little less. It's an alright peice of kit, pfc in our subs are 15~35ka dependent on the tx feeding them obviously.
E54 think the company paid £400 is for it maybe a little less. It's an alright peice of kit, pfc in our subs are 15~35ka dependent on the tx feeding them obviously.
E
Engineer54
That's a pretty good price, i'm sure on the last project, a comparable tester was over the £500 mark!!
B
Bobster
Most DNO's, if asked (by enquiry) would say 16kA is the max PFC available on a single phase 100A or less supply.
I don't for one minute believe the Op's supply is any where near the levels of PFC his meter's are indicating, due to inaccuracies and method of measurement, as many posters here have already pointed out.
Typically EFLI meters measure the volt drop in mV at a measurement of around 20-25A load, and at close to the TX is at the lower end of the instruments capabilities (check the accuracy figures quoted in the user manual).
Under actual kA fault levels it is doubtful the TX could even supply the installation at that level of fault current before the cut fuse failed
The OP would either need a more accurate meter, or use IQ's method of measurement, as any slight discrepancy in the loop reading has a massive bearing on the PFC reading.
When you consider the DNO's supply cable has some resistance, as well as the cut out fuse and the meter itself as well the tails, then the calculations don't really add up, as the fuse, the Dno's cable, the meter and the tails would need a total resistance of 0.001 ohms for a PFC of 23kA single phase calculated @ 230V
I don't for one minute believe the Op's supply is any where near the levels of PFC his meter's are indicating, due to inaccuracies and method of measurement, as many posters here have already pointed out.
Typically EFLI meters measure the volt drop in mV at a measurement of around 20-25A load, and at close to the TX is at the lower end of the instruments capabilities (check the accuracy figures quoted in the user manual).
Under actual kA fault levels it is doubtful the TX could even supply the installation at that level of fault current before the cut fuse failed
The OP would either need a more accurate meter, or use IQ's method of measurement, as any slight discrepancy in the loop reading has a massive bearing on the PFC reading.
When you consider the DNO's supply cable has some resistance, as well as the cut out fuse and the meter itself as well the tails, then the calculations don't really add up, as the fuse, the Dno's cable, the meter and the tails would need a total resistance of 0.001 ohms for a PFC of 23kA single phase calculated @ 230V
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