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G bizzle

Megger mft1553

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G bizzle

Megger mft1553

Am i right in what im saying here

 

Ze

open main switch to db.

Remove main earth

Use red+green leads

high loop setting

Measure between cpc+line

Record results in ohms

 

PFC

Reconnect main cpc

Use red+green black leads

Test between cpc neutral line

Pfc setting

Record results in KA

 

Zs

Testing live circuits with rcd protection

Use red+green+black leads

Measure between cpc+neutral+line at end of circuit

No trip setting

Record results in ohms

 

 

 

Edited by G bizzle
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SLIPSHOD & SLAPDASH

I would use the terminal/cable names rather than lead colours. My Metrel uses black for line , blue for neutral & green earth. My new Fluke uses brown for line.

Most, but not all meters will record/test Pfc when testing Ze.  I also test for Psc  PFC is tested Line to Earth. 

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Risteard
On ‎11‎/‎04‎/‎2018 at 08:50, SLIPSHOD & SLAPDASH said:

I also test for Psc  PFC is tested Line to Earth. 

 

Not correct.

 

PEFC is Prospective Earth Fault Current which is phase (or line if you want to be all 17th-Editiony) to Earth.

PSCC is Prospective Short-Circuit Current which is phase to neutral (or between phases in a polyphase installation).

PFC is Prospective Fault Current which is the greater of the PEFC and the PSCC.

Edited by Risteard

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G bizzle

Yes i know this mate thankyou. To test this with a megger mft1553. I know its a live test with the main switch and mcb's in the open position.

Is it the pfc loop setting 

Red+ green leads that you use for the measurement.

Regards

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SLIPSHOD & SLAPDASH
11 hours ago, Risteard said:

 

Not correct.

 

PEFC is Prospective Earth Fault Current which is phase (or line if you want to be all 17th-Editiony) to Earth.

PSCC is Prospective Short-Circuit Current which is phase to neutral (or between phases in a polyphase installation).

PFC is Prospective Fault Current which is the greater of the PEFC and the PSCC.

 

quite right. I am getting to old with all the same things having the names changed. Bring back live, neutral & earth, nothing else  :coat

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G bizzle

Guinness

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