3 63 amp RCDs on same circiut

[malcolmsanford]

did we ever do a ramp test ........................I'll get my coat

 

[Knobhead]

i know it wouldnt leave the install like it permentaly they really need to use the install so it would only be temp if i did

On your head be it!

 

[Rockingit]

SO many unanswered questions on this, or questions that need to be asked. Have you considered getting another sparks in to do this one on your behalf? You sound a little out of your depth.

 

[king_11]

okay think ive found the faulty circuit, i did IR and got 223 on E - N and L - N }500 set on 500v. its a light cicriut 1.5mm

 

[UNG]

okay think ive found the faulty circuit, i did IR and got 223 on E - N and L - N }500 set on 500v. its a light cicriut 1.5mm

223 & 500 what Ω or MΩ

I think you need to consider involving some one with a little more knowledge than yourself in the best interests of all concerned

 

[king_11]

MΩ. Fault has gone. ive isolated that circuit

 

[emc]

Sounds like a non sensicle installation. 100A RCD feeding 63A RCD all 30mA instant... Why? you have discrimination issue immediately. The second MCB seems to serve no purpose - could just be a MCB.

 

[Rockingit]

200 odd MOhms is a perfectly acceptable value, so not sure how you can claim that to be the fault when clearly so many other issues seem to exist. Do the maths, and you'll see why it's not going to be an IR value of 200M that's causing a 30mA RCD to trip.

 

[king_11]

Do you have an IR tester? as what you are discribing could well be an underlying low resistance that on its own is not enougth to cause a tripping situation, but when a suden increase in load is seen it unbalences the RCD. (this is very common)

Correct! You know your stuff mate! #cheers