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

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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
 
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