megger question.

[electricalperson]

does anybody have or know where i can download and print some documentation that says using a megger is a good idea? im talking about something, for example, from an arc fault breaker manufacturer that mentions the use of a megger. i hope you guys know what im talking about

i know theres plenty of information on here i just need something i can print out thats from a major electrical equipment manufacturer or something like that

 

[480sparky]

Try this .

 

[electricalperson]

Try this .

thats not what i mean

i mean documentation from a company that says in order to troubleshoot properly you need a megger

example: somebody calls up an arc fault breaker company and they say to use a megger to figure out why the breaker keeps tripping.

example 2: wire company says a megger test should be preformed before energizing

i need stuff like that on paper. if you need to know the reason PM me and ill tell you

 

[zog]

thats not what i mean

i mean documentation from a company that says in order to troubleshoot properly you need a megger

example: somebody calls up an arc fault breaker company and they say to use a megger to figure out why the breaker keeps tripping.

example 2: wire company says a megger test should be preformed before energizing

i need stuff like that on paper. if you need to know the reason PM me and ill tell you

How can we tell you if it is required if we dont know what equipment you are talking about?

 

[electricalperson]

How can we tell you if it is required if we dont know what equipment you are talking about?

panels, breakers, transformers, wire. etc thats what im talking about. a good general requirement for residential, commercial and industrial products

 

[480sparky]

Try digging in this gold mine.

 

[Cow]

110.7

The tool used to verify this is a megger. What more do you need?

 

[electricalperson]

110.7

The tool used to verify this is a megger. What more do you need?

i understand that 100% and agree that article wants us to megger circuits but the problem is certain people (not on this site ) will argue and say an ohm meter is good enough but i dont agree

 

[zog]

panels, breakers, transformers, wire. etc thats what im talking about. a good general requirement for residential, commercial and industrial products

NFPA 70B, ANSI, IEEE, NETA, ICEA, etc.... Take your pick. Or check the equipment installation and or maintenence manual from the manufacture.

 

[ike5547]

if you need to know the reason PM me and ill tell you

I'll take a guess. You megger'd someones TV?

 

[zog]

i understand that 100% and agree that article wants us to megger circuits but the problem is certain people (not on this site ) will argue and say an ohm meter is good enough but i dont agree

Well those certian persons are clueless and dont understand how a ohmeter or a megger work. Ask them how they think a few volts (depending on the ohmeter brand /model) can stress and test the insulation of anything. I suppose they think that the "O.L." on thier meter means "infinite" or "overload". Ask them to explain how an "ohmeter" works (No such thing as an "ohmeter", just an "ohm-calculator").
I never did understand how someone can be considered "qualified" to use a peice of test equipment and not understand how it functions.

 

[480sparky]

Try this:

Every one here on this forum says so.

Press Ctrl-P and show them that.

 

[electricalperson]

I'll take a guess. You megger'd someones TV?

not yet

 

[ohmhead]

megger /ohm meter testing

megger /ohm meter testing

well megging a wire or conductor is the only way to test insulation a ohm meter is only good for continuity of conductors thats pretty much it , so hook up your megger to the circuits and test for a leak in the insulation . If you have a pin hole in that insulation a megger will give you a low reading if you use a ohm meter it will not detect anything you need high voltage to test insulation .comments ? best to ya

 

[480sparky]

Try this.

Or this.

Maybe this.

Possibly this.

Or this.

Could this help?

Or this?

 

[wptski]

well megging a wire or conductor is the only way to test insulation a ohm meter is only good for continuity of conductors thats pretty much it , so hook up your megger to the circuits and test for a leak in the insulation . If you have a pin hole in that insulation a megger will give you a low reading if you use a ohm meter it will not detect anything you need high voltage to test insulation .comments ? best to ya

What's the difference between a pinhole in the insulation and end of every insulated conductor in the world where it's stripped?

 

[480sparky]

What's the difference between a pinhole in the insulation and end of every insulated conductor in the world where it's stripped?

You generally strip it to terminate it. A 'pinhole' is not a desired characteristic of insulation.

 

[ohmhead]

voltage & insulators

voltage & insulators

Well first you are testing insulation with say hv 1000 volts between conductors its just a test to pick up a bad point say a pinhole or nick in the wire under test . at 120 volts you dont have the voltage to pass thur that pinhole in that insulation but over time even at 120 volts with age that hole will get bigger due to electrical conduction to ground and heat or dampness and just plain old life span of insulation it shorts . You dont have that problem at terminals because its connected to lower voltage a point of opposite polarity and also not enough potential to pass just randomly to any point . best to ya

 

[wptski]

You generally strip it to terminate it. A 'pinhole' is not a desired characteristic of insulation.

Not desired but it won't show anything when meggered. It's just a bare spot just like the stipped end. Unless the insulation melts, turns to carbon, bridges to another conductor or ground, you'll see nothing.

 

[Fulthrotl]

Try this:

Every one here on this forum says so.

Press Ctrl-P and show them that.

no. tell them this.......

"zog says so."

and if that isn't enough,

"fulthrotl says that zog says so."

that should hold them.