Transcription of TECHNICAL TOPIC STUDENT MINIMISING VOLTAGE …
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TECHNICAL TOPIC STUDENT MINIMISING VOLTAGE …
10 NAPIT0870 444 1392 the previous issue of The Competent Personmagazine, we considered the five basic steps forworking out the correct size of cable for a particularload. Due to the importance of this subject, we oughtto consider it further. In particular, we ll look at thecross-sectional areas of neutral conductors andprotective conductors. Co-ordination between conductorand protective deviceRegulation 433-02-01 in Section 433 contains therequirements for the relationship between theconductor and the overcurrent device which protects terms included in this Regulation are:Ib= the load currentIn= the nominal current rating of the overcurrentprotective deviceIz= the current-carrying capacity (that is, the currentrating) of the conductorsI2= the current causing effective operation of theovercurrent protective device. That being said, Regulation 433-02-01 can besummarised as follows:(i)In>Ib(ii)Iz>In(iii) x Iz>I2 Regulation 433-02-02 states that, for the followingdevices, compliance with condition (ii) above resultsin compliance with condition (iii).
2Table 54G If the adiabatic equation looks like too much trouble, then the good news is that you can use Table 54G of BS 7671. Reference to Table 54G shows that, where the associated phase conductor has a
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