Insulation Resistance testing - again!

[chrisgc]

Remove the line cables from the FCU and connect them together, reconnect when you have finished your IR testing.

Would that be the same as just switching the FCU off?

And how would the remaining cable then be tested? ie the cable run from FCU to the appliance Switch?

 

[trev]

No Chris it's not the same as switching it off mate, it's putting the cables into a connector for the duration of the test so as not to get a false reading through the neon

 

[tigerpaul]

Just take the incoming and outgoing line conductors out of the FCU and join temporarily. You don't need to do the neutrals, just make sure the FCU is switched on. Then when you do the IR test, the neon won't cause a false reading.

 

[chrisgc]

No Chris it's not the same as switching it off mate, it's putting the cables into a connector for the duration of the test so as not to get a false reading through the neon

As that would then test the cable up to the FCU point - how would the remainder of cable (from FCU to appliance socket outlet) be tested or is this in general left untested?

 

[chrisgc]

All understood now As wasnt seeing all the new replies (refresh button is a great invention) - So obviously taking the line cables out of fCU and switching FCU to on will then keep circuit but bypass the neon indicator light.

Got it.

Thanks everyone.

 

[chrisgc]

While we are on the subject of IR test just a question about R1 R2 jump leads. What cable size do you tend to use if you have made your own?

 

[Guitarist]

All understood now As wasnt seeing all the new replies (refresh button is a great invention) - So obviously taking the line cables out of fCU and switching FCU to on will then keep circuit but bypass the neon indicator light.

Got it.

Thanks everyone.

You won't need to switch the fcu to anything. The cables will be joined outside the fcu.

 

[DaveyD]

You won't need to switch the fcu to anything. The cables will be joined outside the fcu.

I think it's refering to TigerPaul's idea - he mentioned just linking the lines outside the switch so the neutrals are still in the SFCU and therefore to include the neutrals the switch will still need to be closed.

 

[rare breed]

Kind of related to the above thread.
I am doing the 2391 practical tommorow, to speed up my testing on a rig is there a problem with doing the Insulaion testing prior to the continuity for the Periodic?

 

[malcolmsanford]

To be honest unless it as changed dramatically over the years you are advised to test in the order they are laid out in the GN 3 and the continuity test comes before the IR test, so I would do it in order.

Also isn't it an EIC test you do not a periodic, or am I at cross wires when you mentioned "periodic"