When was this invented?

[Jay Sparks]

I'm just curious to know when (date/year) the first instrument was used to measure PEFC and PSCC?
And what the instrument was?

Jay

 

[Silly Sausage]

I'm just curious to know when (date/year) the first instrument was used to measure PEFC and PSCC?
And what the instrument was?

Jay

Testing Live?


If Dead, way back when with an Ohmmeter and calculation.

 

[Jay Sparks]

Testing live!

It was just something a colleague asked me today and it made me curious.

 

[Silly Sausage]

I bet Megger would know, give them a call.

 

[Jay Sparks]

I bet Megger would know, give them a call.

I'm not that curious..lol but thanks for the info.

Jay

 

[Silly Sausage]

I'm not that curious..lol

Jay

Tut tut, I'm disappointed in your dedication to the history of the Trade!

 

[telectrix]

Well. I've got a megger efli tester supplied new 1979, but sure they were out a bit before then.

 

[davesparks]

You occasionally see some very old earth loop impedance testers made by clare or Evershed and Vignoles on eBay .
They are usually beautiful old wooden cased jobbies

 

[Barry White]

heres a few

WALTRIC EARTH LOOP IMPEDANCE TESTER - MAJOR MODEL | eBay

CLARE V131 EARTH LOOP TESTER | eBay

Veltest Vintage Neutral-Earth Loop Impedance Tester | eBay

no idea of when invented just got curious and looked on the bay

 

[Engineer54]

heres a few

WALTRIC EARTH LOOP IMPEDANCE TESTER - MAJOR MODEL | eBay

CLARE V131 EARTH LOOP TESTER | eBay

Veltest Vintage Neutral-Earth Loop Impedance Tester | eBay

no idea of when invented just got curious and looked on the bay

Loop testers have been around a long time now certainly since i've been in the trade (aged approx 13 working with my uncle, who owned a big black bakelite cased ELI tester)!!

The Waltric meter above has a patent number that suggests it was filed in 1959, but i'm sure loop testers have been around long before that. Pretty sure i've seen a WD model used in WW2 on sale on ebay some years ago....