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Student & Learning Zone - City & Guilds
Is Your Selected Cable Suitable?
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<blockquote data-quote="Zeespark" data-source="post: 345486" data-attributes="member: 400"><p>Supply voltage = Volts</p><p></p><p>Ib - design current = Amps</p><p></p><p>Protective device type = BS</p><p></p><p>In - protective device rating = Amps</p><p></p><p>Length of run of cable = Metres</p><p></p><p>Power factor =</p><p></p><p>Cable Type :</p><p></p><p>Installation Method :</p><p></p><p>Ambient Temperature =</p><p></p><p>Number of circuits including this one =</p><p></p><p>Length of cable in thermal insulation =</p><p></p><p>Apply Correction factors:</p><p></p><p>From TABLE 4C1 : Cg =</p><p></p><p>From TABLE 4B1 : Ca =</p><p></p><p>From TABLE 52.2 : Ci =</p><p></p><p>Protective device factor : Cc =</p><p></p><p>It = tabulated current carrying capacity</p><p></p><p>It = In / (Cg x Ci x Ca x Cc)</p><p></p><p>It = / ( )</p><p></p><p>It = Amps</p><p></p><p>From TABLE Cable selected = mm²</p><p></p><p>TABLE For mm² ; mV/A/m =</p><p></p><p>mV/A/m corrected for power factor = mV/A/m x Power Factor =</p><p></p><p>Volt drop = (mV/A/m x Length x Design current) / 1000</p><p></p><p>Volt drop = ( ) / 1000</p><p></p><p>Volt drop = Volts</p><p></p><p>(Maximum permissible volt drop (regulation - 525) = Volts)</p><p></p><p>Calculated Cable size = mm², Minimum Earth conductor size = mm² (Table )</p><p></p><p>Maximum Cable Length = Metres</p><p></p><p>I have nicked this from another post a while back (Dont ask Me which, I have a hard enough time remembering what day of the week it is these days)</p><p></p><p>I would also say, once you have done your cable calc, run it through the adiabatic equation.</p><p></p><p>Andy</p></blockquote><p></p>
[QUOTE="Zeespark, post: 345486, member: 400"] Supply voltage = Volts Ib - design current = Amps Protective device type = BS In - protective device rating = Amps Length of run of cable = Metres Power factor = Cable Type : Installation Method : Ambient Temperature = Number of circuits including this one = Length of cable in thermal insulation = Apply Correction factors: From TABLE 4C1 : Cg = From TABLE 4B1 : Ca = From TABLE 52.2 : Ci = Protective device factor : Cc = It = tabulated current carrying capacity It = In / (Cg x Ci x Ca x Cc) It = / ( ) It = Amps From TABLE Cable selected = mm² TABLE For mm² ; mV/A/m = mV/A/m corrected for power factor = mV/A/m x Power Factor = Volt drop = (mV/A/m x Length x Design current) / 1000 Volt drop = ( ) / 1000 Volt drop = Volts (Maximum permissible volt drop (regulation - 525) = Volts) Calculated Cable size = mm², Minimum Earth conductor size = mm² (Table ) Maximum Cable Length = Metres I have nicked this from another post a while back (Dont ask Me which, I have a hard enough time remembering what day of the week it is these days) I would also say, once you have done your cable calc, run it through the adiabatic equation. Andy [/QUOTE]
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