PDA

View Full Version : Testing spec calls for low-resistance "Megger Testing" to inspect for high resistance


madMAX
February 17, 2015, 09:27 AM
Found this in a commissioning spec and it made me chuckle so I figured I would share it. :p
veracon0700
April 25, 2015, 05:20 PM
That's funny because it seems like the stereotype of test technicians is everything that we do involves using a "megger." I couldn't count how many times people have asked me if I was there to "megger the equipment." One time a guy even pointed to my high current test set and said "that's a really big megger."
stuebes
July 6, 2015, 09:09 PM
I've seen several specs refer to megger testing when the design engineer is not familiar with acceptance testing. Megger test seems to be the most widely known so we often hear people ask for megger tests on equipment, whether its appropriate or not.
DanielTronco
July 9, 2015, 09:20 AM
Sounds like another rough copy of the NETA spec calling for one of three methods for checking bolted connections. i see little pieces of the NETA spec copied into testing scopes from GCs and comm engineers alot. But hey megger probably makes a DLRO anyway haha.
baldscreen
July 27, 2017, 07:20 PM
Found this in a commissioning spec and it made me chuckle so I figured I would share it. :p

You gotta love boilerplate specifications. I think most of the bid specs we get to quote on are 80% fluff.
wrh9278
August 2, 2017, 02:22 PM
Megger makes a DLRO right? So its kind of accurate :p
baldscreen
August 2, 2017, 03:33 PM
Megger makes a DLRO right? So its kind of accurate :p

The term "Megger" has traditionally been short-hand for "insulation resistance" measurements. You are checking the quality of insulation in some piece of equipment. I don't know if Megger was a company that made it's bones producing the old hand crank units way back when. Or if it was the term developed because you were measuring Meg-Ohms of resistance. Maybe both.

Biddle-Megger (the company) makes a lot of different test equipment. Among them are a number of Digital Low Resistance Ohm-meters or DLROs. They are useful for measuring resistance across breaker contacts, bolted bus joints, etc.
cjones09
August 3, 2017, 03:38 PM
The term "Megger" has traditionally been short-hand for "insulation resistance" measurements. You are checking the quality of insulation in some piece of equipment. I don't know if Megger was a company that made it's bones producing the old hand crank units way back when. Or if it was the term developed because you were measuring Meg-Ohms of resistance. Maybe both.

Biddle-Megger (the company) makes a lot of different test equipment. Among them are a number of Digital Low Resistance Ohm-meters or DLROs. They are useful for measuring resistance across breaker contacts, bolted bus joints, etc.

It's just like calling your Linemans pliers "Kliens", or calling an adjustable wrench a "cressent" wrench.