By B. D. Jenkins, Mark Coates
This e-book offers advice on how one can perform the calculations required for circuit designs in compliance with the Wiring laws. it's been up-to-date to take account of adjustments brought by way of BS 7671 : 2001 and modification 1 to the traditional which incorporated a brand new desk of current-carrying capacities.
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Additional info for Electrical Installation Calculations: For compliance with BS 7671: 2001
The voltage drop is: 230 þ 72:1 4 Â 45 Â 20 V ¼ 3:45 V 230 þ 85 1000 When a circuit is protected by a semi-enclosed fuse to BS 3036 the conductor crosssectional area one has to use is greater than if the protective device was an HBC fuse or miniature circuit breaker (of the same current rating). It follows that the ratio Ib =Ita will be less as will then be the actual operating temperature. 98C. Thus, when using semi-enclosed fuses to BS 3036, another option open to the designer is that instead of calculating the actual conductor operating temperature the following factors may be applied as multipliers to the tabulated mV/A/m values in order to obtain the design values, provided the expected ambient temperature is 308C.
The voltage drop line-to-line is given by: 550 Â 60 Â 0:25 A ¼ 4:13 V 2 Â 1000 Calculation of Voltage Drop Under Normal Load Conditions 47 Note the introduction of the factor ‘2’ in the denominator, because there are 2 cables in parallel. Now consider the more accurate approach for grouped circuits. 94. 917 if the cables are 858C rubber-insulated. e. design (mV/A/m)r 230 þ t1 ¼ tabulated (mV/A/m)r 230 þ tp but the design (mV/A/m)x ¼ tabulated (mV/A/m)x because reactance is not inﬂuenced by temperature.
Give compliance with the adiabatic equation in Regulation 434–03–03) but not cause disconnection of the motor circuit because of high starting currents. CIRCUITS FOR STAR-DELTA STARTING OF MOTORS Another problem associated with motors is the current demand when star-delta starting is used. With star-delta starters six conductors (two per phase) are required between the starter and the motor, the star or delta connections being made in the starter. pﬃﬃﬃ During the running condition the current carried by each of the six cables is 1/ 3 times that of the supply cables to the starter (the connection being delta).
Electrical Installation Calculations: For compliance with BS 7671: 2001 by B. D. Jenkins, Mark Coates