ELI Test On Smoke Alarms Circuits

[New2Game]

Can you do a ELI test on circuits containing Smoke Alarms? I know you cant do IR tests on them , but not sure about ELI. Can someone please clarify

 

[Spark123]

Why wouldn't you? As an EFLI tester draws around 25A it may operate a B6 mcb, Zs = Ze + (R1+R2) can also be used.
There is a requirement to IR test all circuits before energizing, wether you disconnect the smokes or join p&n together and test to earth is up to you. Have you got a copy of GN3?

 

[New2Game]

Yeah but couldnt find about smokes. Just thought current from ELI light damage circuit boards in smokes, thats all. Cheers for reply

 

[Spark123]

They are just the same as any other circuit, you need to prove it will disconnect. I wouldn't touch the interconnection wire with any instrument with smokes connected though.

 

[New2Game]

What would you do, disconnect smokes before EFLI test?

 

[Spark123]

Do the alternative method, Zs = Ze + (R1+R2).

 

[New2Game]

If its a TN-S system can i just presume 0.35ohms? Or do i have to test it with a meter?

 

[Spark123]

Measure Ze using ELFI tester!! Add this to your R1+R2 reading from the smoke circuit.
Ze for TN-S is max 0.8ohms. You need to verify this to confirm the earth has been connected.