Does freezing cold temps mean bad IR values ?

[JM ELECTRICAL]

i am testing 4 flats in the one close, high rise flats were being brought down next to them so tennants have been moved out for a few months, and its freezing cold in glasgow right now, when testing the house ring which is wired through conduit i am getting between 30 - 50 mega ohms going between each of the cables in each of the flats and they were rewired 2 years ago, would this effect the results ?

 

[telectrix]

damp could be a factor, but with those readings, why worry?

 

[Marvo]

Not sure what voltage your IR test was at but as Tel says 30-50 Megs is certainly not worth chasing especially if conditions are cold and damp.

 

[JM ELECTRICAL]

It was done at 500V, i was just wondering because the flats have recently been rewired and the fact it is installed in conduit i would expect much better readings and because the flats were all giving roughly the same reading i was wondering if that would be the cause

 

[GEOFF S]

Hi

Its quite common to find low readings in an unheated/damp enviroment. The readings are acceptable, if your worried advise to have a glbal IR test carried out when the flats are occupied.

Cheers

 

[Octopus]

Its over 2 meg so ignore it.

tin hat on

 

[Marvo]

Lol, If you're really curious and have plenty of time on your hands you can go around one of the flats with a hair dryer and gently warm up the CU and accessories such as sockets, switches and light points and see if the global IR reading for that premises improves.

 

[JM ELECTRICAL]

Lol, If you're really curious and have plenty of time on your hands you can go around one of the flats with a hair dryer and gently warm up the CU and accessories such as sockets, switches and light points and see if the global IR reading for that premises improves.

Nah i think ill pass, i was curious not that curious though :lol:

 

[hightower]

Lol, If you're really curious and have plenty of time on your hands you can go around one of the flats with a hair dryer and gently warm up the CU and accessories such as sockets, switches and light points and see if the global IR reading for that premises improves.

Can't. It was rewired 2 years ago meaning plastic cu's so that's a recipe for disaster. The 18th will have a new regulation 'only use a hair dryer to warm up cu's that are metal'

[emoji38]

 

[sparksburnout]

i wouldn't worry too much, life expectancy not that good in that neck of the woods anyway?

 

[Deleted member 26818]

Resistance would be expected to be lower at colder temperatures.

 

[HandySparks]

Resistance would be expected to be lower at colder temperatures.

Resistance of what?

 

[Deleted member 26818]

Of the conductors.

 

[HandySparks]

Of the conductors.

OK, but I thought the thread was about insulation resistance?

 

[Simonslimline]

OK, but I thought the thread was about insulation resistance?

It is.

Just to point out to the OP, it is Megohms by the way. :wink_smile:

 

[Geordie Spark]

Resistance of what?

MY resistance to getting out of a warm bed increases dramatically on a cold day.

 

[Deleted member 26818]

OK, but I thought the thread was about insulation resistance?

Yep.​...