TT Zs Readings and Tripping RCD?

[Sintra]

They do, but I have only ever known them be made to order by specialist protection companies. I can't imagine them ever being used in anything other than a specialist installation, they aren't exactly cheap!

Yes indeed. I've had a quick search and such beasts can be ordered but surely putting these into a domestic situation for final circuits would mean that the tripping times required of 300mS @ 30mA and 40mS @ 150mA are not met.

 

[paulk11]

OK, all credibility (as if I ever had any anyway) is about to be ruined!

Having checked the info, they are standard RCDs and not time delayed!! I was going on colleagues info (honest) and not physically checked the details myself. So all advice above is much appreciated and fully understood. It's all a learning process :sick:

Cheers

 

[davesparks]

Yes indeed. I've had a quick search and such beasts can be ordered but surely putting these into a domestic situation for final circuits would mean that the tripping times required of 300mS @ 30mA and 40mS @ 150mA are not met.

Yes exactly, they are no use for shock protection.
I think they see use as a backup fault protection when 10mA protection is used. But I could be wrong

 

[Deleted member 26818]

Can be used for shock protection, not for additional protection.