If k = 115 from table 43.1, if s = 2.5 mm2 which is the csa of the copper conductors and i = 298.70 a
calculate the maximum duration allowed for the fault current to raise the cable temperature from the
normal operating temperature to the limiting temperature.
ze = 0.352
t =
type your text heres
230v
bs en 60898
16a type b
sfcu
immersion heater
3 kw
measured z, = 0.77 22
circuit run in copper conductors with a csa of 2.5 mm2
(show your answer to
two decimal places)
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-leee recsa jil

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?