Just wondering what you guys generally do to determine the EFLI of a circuit during testing. Do you calculate it, as in Zs=Ze+(r1+r2), or do you measure for each circuit, or both. I tend to calculate it these days, simply as it's quicker, but just wondered what others do.
Discuss EFLI - measure or calculate? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Measure every time.
J
JC94
Usually with RFCs I just stick the megger in and let it do all the hard work, then for anything such as lighting, boiler etc where it'd be considered working live/near live parts (Naughty) I calculate but put a little * on the cert with a note at the bottom noting calculated values
Not naughty at all. How do you get your Ze then? By enquiry? :laugh3:
Measure every time for me. It's a good check that everything's been re-connected as it should be, especially if you do a Z l-n at the same time to check the neutral.
Both. Calculate first to give worst case scenario (before parallel paths) and enter on cert then measure last point on each circuit at the end to make sure this is less than or equal to the calculated value and that everything has been reconnected properly
O
Octopus
Measure every time.
M
MDJ
Sparks measure
S
SirKit Breaker
It is all well and good calculating it, but it doesn't prove that you have an earth, testing it does. I know calculation is acceptable, but measurement is better if you think about it, and although Ze =Zs +(R1+R2], a measured result will always be a bit lower (or should be) due to parallel paths, and the current that the tester is forcing around the circuit.
Cheers……………..Howard
Cheers……………..Howard
And that's why it's better to calculate.
Parallel paths come and go, and you have already proven you have an earth so I don't agree with you at all.
M
MDJ
Hey calm down now LOL
calm down, calm down.....
![[ElectriciansForums.net] EFLI - measure or calculate?](https://electricians.s3.eu-west-1.amazonaws.com/data/attachments/14/14179-0d06725f751af7ba892801f30fc4d4bc.jpg "[ElectriciansForums.net] EFLI - measure or calculate?")
O
Octopus
A brave man to disagree with SirKit Breaker!
Reply to EFLI - measure or calculate? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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