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Answer Posted / pawan dahiya
ELCB full name earth leakage circuit breaker , normaly
ELCB used in main control line & very senstiv eqpment and
ELCB link in VCB\ACB etc. Earth leakage time going to
single in VCB\ACB so main breaker trip . But fire pumps do
not used becouse fire pumps is very emergency system.
becouse ELCB leakage time do not running the fire pumps.
fire pumps used only two earthing
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a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5
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