Insulation Resistance of floodlights

[Marvo]

If the IR test was at 250v and no higher it's fairly unlikely it's an MOV, the clamping voltages are usually higher than that unless they're the type sometimes used in telecommunications and RS232 and other comms systems.

 

[SPARTYKUS]

Yep never heard of a MOV

 

[VoltzElectrical]

Yep never heard of a MOV

not just me then Solo.

 

[guest119]

0.14 what, bannanas,ohms, megohms, pineapples?
There is no such thing as a dead short. Its a fault of negligible impedance that exists.

 

[Marvo]

Yep never heard of a MOV

not just me then Solo.

MOV's are used as lightning and surge protection all the way through the network from transmission lines to being internally installed in control panels and appliances. They come in a multitude of guises.
All these are MOV based protectors and they'll all give low IR reading with a megger tester set on a high test voltage.



Many appliances have an internal filter circuit PCB which has MOV's on it amongst other things.

 

[Lucien Nunes]

This is daft. We're 26 posts into a thread called "Insulation resistance of floodlights" and the OP still hasn't told us what the insulation resistance of his floodlight is. It could be anywhere between 0.14 ohms and 0.14 megohms, which is the same ratio as that between a pint of beer and 24 articulated tanker lorries of it.

 

[micknew]

Perhaps he's not a qualified sparks.

 

[Davetherave]

0.14 ohms

 

[HandySparks]

0.14 ohms

OK, how are you measuring this 0.14 ohms?
Is the floodlight connected to the supply cable while you're measuring?
Is it connected in parallel with several other lights?
Where exactly are you connecting your test leads to?
What's the Zs of the supply at the base of the lamp column?
What type of lamp is it?

 

[SparkyJoe]

I Might have had too much beer (Slow week) but should that not be 0.14 Meg ohms? 0.14 ohms is rather low lol

 

[Marvo]

......ested at 250V

0.14 ohms

Doesn't sound right, unless you paid a fortune for it I doubt your tester is capable of distinguishing such a low resistance on the 250v test range.

 

[HandySparks]

I Might have had too much beer (Slow week) but should that not be 0.14 Meg ohms? 0.14 ohms is rather low lol

Exactly. Hence asking for clarification from the OP. He says 0.14 ohms, which then raises a whole lot of additional questions to enable us to try and work out what's happening.

 

[Lucien Nunes]

0.14 ohms

Well if it's really 0.14 ohms L-E and the light works, the CPC must be O/C somewhere and there is a risk of exposed bits being live. If this is not obvious to you, I suggest studying a bit more about testing before undertaking this kind of work.

 

[PEG]

...I think he's gone to purchase a non-conductive ladder...:conehead:

 

[VoltzElectrical]

Not sure why he is testing IR on the cable drop. The light
works, leave it alone!

 

[dazza1981]

OK so you walked over to a random floodlight that was WORKING and thought hummmm im going to do an insulation resistance test on this working light????
WHY MATE ???
Alternatively if you are part of the electrical trainee Nerd Herd then leave the flood well alone and let it continue working normally as it is before you do F it up !!