pfc results

[buddha]

hi , my newly calibrated meter seems to work fine but I seem to be getting really high results for pfc,quite often well over 6ka,Ze readings rarely over 0.03 ohms, most of these tests are on boards in high rise flats,would all the earths from each flat cause a really low ze reading and high pfc results? should I really be changing every breaker to 10ka breaking capacity breakers?? has anyone had the same observations? my meter is a megger multifunctional tester,about 7 years old now.

 

[Tony S]

is there any front end protection for each flat at the intake?

 

[Blue Duck]

Is there a substation in the basement?

 

[kerching]

Does it need to be zeroed?

if so how have you done this?

is your PFC calculated by the meter directly from the Ze, i.e. A dual,reading. As an un zeroed Ze will,give a moody reading and even moodier PFC

my Fluke has to be zeroed and comes with a funky metal,shorting adapter . I do not know f this applies to all meters

 

[sprocketflup]

Just as an aside, have you seen how much them zeroing adaptors are to buy on their own?

Don't lose it!

 

[kerching]

Just as an aside, have you seen how much them zeroing adaptors are to buy on their own?

Don't lose it!

Fleabay.  £34 !

mine was bundled in a NOT to be missed deal from

@megger mark

@megger mike

@Megger Jase ( the boy)

pity they Hey do not have a Signaltek or VII Pro  :slap

 

[sprocketflup]

They've gone down then, was getting on for £50 when I looked. £50! That's almost as much as a plumber charges for 3 minutes of their time

 

[kerching]

They've gone down then, was getting on for £50 when I looked. £50! That's almost as much as a plumber charges for 3 minutes of their time

Or a few people on here, I am lead to believe, allegedly :innocent

 

[Rob_the_rich]

This is an oddly named thread. The PFC results are correct for the Ze readings you have (Ohm's Law). Low Ze in Flats might occur for a number of reasons, could be a Tx in the basement and 3 core SWA, 3rd core and armour as Earthing conductor would lower Ze.

I recently found my funky fluke zeroing adaptor, used an earth block in the interim.

 

[kerching]

I recently found my funky fluke zeroing adaptor, used an earth block in the interim.

Never thought of that....used to,use a bit of stripped 6mm and was always losing it

i wonder if leads have just been clipped together and the hinge is the issue

just saying

 

[apprentice87]

I cannot see the problem: 230 / 0.03 is???

So the place has a low Ze and a high PEFC. Oh well, as has been pointed out this is perfectly normal. I went to a house the other day and they had an 11kV TP supply to a pole actually in their garden and a rather large TX to supply the whole village on the pole just about 30 feet from their cutout. Bet their PFC and PEFC were just a little high!!

When Tony mentioned "front end protection" there was a very good and valid reason for that..

john..

 

[Rob.]

People should also look at let through energy. 

Just because you have a PFC of XX KA, does not mean that if there is a fault that is what will flow. This is to do with upstream protection. 

 

[apprentice87]

When Tony mentioned "front end protection" there was a very good and valid reason for that..

Umm, why you think i mentioned that..

john..

 

[Rob.]

Umm, why you think i mentioned that..

john..

Sorry John, I'm a sod for skim reading sometimes. 

 

[sprocketflup]

I'm really surprised no-ones mentioned front end protection yet :slap

 

[kerching]

Dont point (fat) fingers  :B

Glass houses and all that  :innocent

 

[Sidewinder]

Is the meter a random number generator?

AKA MFT?