A Soft Test

[basic]

When if doing a soft test on an rcd protected ring how long doe the test have to be taken for?

20mS?
30mS?
40mS?

Thanks in advance

 

[Spark123]

When if doing a soft test on an rcd protected ring how long doe the test have to be taken for?

20mS?
30mS?
40mS?

Thanks in advance

AFAIK in practice the suggested test period should not exceed 2s, although this can be extended for time delay RCDs. I don't know if there are any regs specifying this.

 

[basic]

Thanks for that. I'm a third year apprentice and I could'nt for the life of me find anything on
"Soft Testing" in any literature I own including GN3, OSG, REGS

Thanks Again

 

[crystal ball]

Pardon my ignorance, what is a soft test

 

[bushynut]

A soft test is when your attempting to do an Earth Fault Loop Impedance Test and the Rcd keeps tripping before the measurement can be taken, hence you do a Soft test!

Soft Test - A low test current (15mA) should be applied for 2S, this will then give the Earth Fault Loop Impedance Test result, which can be checked by adding the R1 +R2 +Ze = Zs

 

[crystal ball]

Thanks, never heard it called that before