Insulation resistance test

Hi , can anyone tell me if 55.74 is ok on a insulation resistance test

55.74 what ohms, Mohms, mOhms, ?

And on what circuit, an 11kV motor, a lighting circuit in the house etc. etc.

What test equipment do you have?

Just info required?

On a ring main in a house ,  with a multi tester set on 500v

There Is NO simple yes or no answer to your question without fully evaluating the circumstances you are testing. e.g. What type of installation, brand new rewire or a periodic inspection on a 40+ year old installation. Where are your readings taken i.e. between which conductors? and what are the readings between the other conductors and what regulations do you think are applicable to deciding what is a satisfactory reading. Different answers to some of the above would result in either a satisfactory or unsatisfactory evaluation of your results.

Doc H. 

To expand a bit further, if I were to ask is £7500.00 a good price for a second hand car? Without far more detail about the make model age service history etc, the monetary value is meaningless. As with 99% of electrical testing, just pressing a button and reading a figure on a display is a meaningless exercise without taking into account the environment, the age, the point on a circuit with reference to another point, the purpose of your testing etc.  If you can fill us in a bit more about the what, where & why of your tests, we can probably guide you a bit easier.

Doc H   

The values L to N is 2000

The value L to E is 2000

L to N is 55.74

the installation is the old wiring red and black

colour of the insulation does not affect its resistance

if those figures are Ohms, then I suspect you have something connected to the circuit such as an appliance giving false reading L-N.  We generally fail any circuit showing less than 2 Meg Ohms (ie 2 million Ohms), or investigate for a fault.

Couple of questions for you:-

1/ Are you testing becuase of a fault?

2/ do you have an electrical background? (don't worry if you haven't, but please be honest and upfront with us, electricity is firkin dangerous stuff, we don't want to giving you advice that could lead to your untimely death or injury).

Jeff Hall said:

The values L to N is 2000

The value L to E is 2000

L to N is 55.74

the installation is the old wiring red and black

Click to expand...

You have still not answered ohms, or megohms.

Ohms, no you have a  problem. Megohms, yes that's fine.

You have given two L-N readings

Sorry about values given

it’s the N to E that’s 55.74 megohms

wondering if the cables r ok or need replacing

whats your background / what training do you have?

Jeff Hall said:

Sorry about values given

it’s the N to E that’s 55.74 megohms

wondering if the cables r ok or need replacing

Click to expand...

If all the values are megohms you have nothing to worry about.

Thanks Dave , I’ve only done electrical work along side fitting kitchens etc, just trying to get up to speed with testing,  ive not tested older 

cables before only on new cables in a training center. I want to stop doing the joinery and start doing electrical full time. Something I should have done years ago.