Insulation Resistance

[andytucker]

Hi i`m new poster, qualified electrician but not working as one just using it for my home.

I have installed an extractor fan with low voltage light in en-suite and now have to do a minor works tests.
I have done the resistance test an my readings are

l/n 0.8
l/e 1.7
n/e 1.3

earth fault loop 6.13
rcd operation 0.2

are these test results acceptable or do i need further testing.

also how do you do a earth continuity test on a low voltage light when it doesnt have one.

thanks in advance.

 

[infinity]

you ask how you do an erth continuity test with no earth, yet you have a Zs reading? Also RCD 0.2? what is?

 

[MDJ]

What is the earthing arrangements? TT by any chance?, whats 0.2 mean with the RCD test? what is the results of x half, x1 and x5 on both 0 degrees and 180 degrees?

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you ask how you do an erth continuity test with no earth, yet you have a Zs reading? Also RCD 0.2? what is?

ah beat me too it haha

 

[rattlehead85]

Blimey you best call an Electrician!! With readings like that i would be concerned. As for the RCD reading. What is all that about?

 

[Geoffsd]

Could do with some units to go with the numbers.

They all seem a bit odd.
Efl is high although within the limit for 6A mcb.
RCD should be milliseconds - no way it's going to be 0.2mS.

Are you doing it right?

 

[andytucker]

ok i try again it is TT sytem

 

[rattlehead85]

I wonder how much equipment he has now frazzled by applying L-N insulation test as i wouldn't mind betting that reading was taken without disconnecting anything. Looks to me as though the 0.8 is due to something still connected possibly the fan itself!! As far as the Zs value although it complies it shouldn't normally be that high unless it is on a T.T system. Looks like you have either loose or poor connections at fittings or a poor Ze value.

 

[MDJ]

still doesn't explain the RCD reading of 0.2

 

[andytucker]

question 5 part3 rcd operation rated residual operating current 6000ma and operating time of ?ms?
what should it be

 

[rattlehead85]

0.2 maximum disconnection on T.T but you should be measuring the actual mS tripping parameters of the RCD itself. You will no wY get 0.2mS!!

 

[andytucker]

i removed all the lamps and left all switches on, is it best to remove the cables are cu from the bars so you are testing just the lighting circuit required.?

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havent frazzled anything by the way

 

[JulianC]

RCD operating current of 6A?

So are you a qualified electrician or are we helping you with your homework?

 

[rattlehead85]

It sounds like you don't have enough knowledge or experience to even be removing the cover on your fuseboard mate especially if you do mot know how to test or interpret test results correctly!

 

[MDJ]

still waiting for times half, x1 and x5 readings on 180 and 0 degrees by the way???????????? can't wait for the times half reading

 

[andytucker]

rcd is bs en 60898, sarcasm is necessary i came for help, isnt that what your forum is for

 

[rattlehead85]

An RCD isn't 60898 mate are you sure this isn't a wind up or something?

 

[andytucker]

rattlehead no ned to answer being a liverpool supporter

 

[MDJ]

, is it best to remove the cables are cu from the bars so you are testing just the lighting circuit required.?

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havent frazzled anything by the way

My God whats next? what qualifications have you got? let us know and we may be able to guide you

 

[andytucker]

mcb ok

 

[rattlehead85]

Since when does football have anything to do with you not knowing what you are doing.

 

[JulianC]

Ok, ok, let's start again with a little more honesty shall we?

Hi i`m new poster and not a qualified electrician but I am at college and hope to be one one day. I have got some homework but can't be bothered doing it all myself so I would be grateful if you could give me the answers to the following question:

I have installed an extractor fan with low voltage light in en-suite and now have to do a minor works tests.
I have done the resistance test an my readings are

l/n 0.8
l/e 1.7
n/e 1.3

earth fault loop 6.13
rcd operation 0.2

are these test results acceptable or do i need further testing.

also how do you do a earth continuity test on a low voltage light when it doesnt have one.

thanks in advance.

 

[andytucker]

so guide me then

 

[Plonker 3]

Ask the college tutor who has set you these questions. That is what they are there for.

 

[rattlehead85]

Don't waste ya time Julian mate. He is having a wind up by claiming he is a spark if he asks if 0.8 L-N test reading needs further testing.
Normally i would help and provide guidance but then he starts with a totally unrelated issue.. Joker!!

 

[MDJ]

so guide me then

No not without the RCD readings, if you haven't done these at the minimum then your on a very rocky road

 

[andytucker]

i thought i wouldd come here for help but clearly it is not the friendly forum i thought it was

 

[Plonker 3]

Well people have asked for more information. Yet you dont see to be able to provide it.

 

[Plonker 3]

Ooops double post

 

[electric will]

Rcd is a bs60898? Hope not.

 

[andytucker]

why is that then?