Test Meter - Forum Sponsors since 2007!
This official sponsor may provide discounts for members

Discuss EFLI on TT systems in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

This has probably been asked before.
Can anyone explain to me why the maximum EFLI on a TT system to operate a 30mA RCD in the required time (table 41.5) is 1667ohms yet on a TN system, depending on the device rating ,table 41.3 is max of 15.33ohms (Type B 3A rating) I am aware of NOTE 2 200ohm
 
Electrical2Go - Online Electrical Supplier
This official sponsor may provide discounts for members
B

BillR3

The 30ma device which is quoted as 1667 ohms is a 61008 and does not have over current protection. The 60898 and 61009 both have over current protection and hence require a lower Zs reading to operate in the time scales given in the tables.

Hope this helps.

BillR3
 

Reply to EFLI on TT systems in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Top Bottom