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Do-It-Yourself (DIY) Question & Answer Forum
Changing the main fuse
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 15867" data-attributes="member: 250"><p>Lets have a look at your lighting a bit more..</p><p></p><p>1 x 10amp, 2 x 6amp</p><p></p><p>you calc'd 3.15a &amp; 5.16a &amp; 6.03a = 14.34.</p><p></p><p>This is where the notes in the o-s-g ("intended for guidance only because it is impossible to specify allowance or diversity for every type of installation and such allowance call for specialist knowledge &amp; experience") come in to play a bit more..</p><p></p><p>I would tend to apply the 100watt per lampholder in calculating CABLE SIZE!</p><p></p><p>but use actual bulb loads to calc max demand/diversity or the circuit..</p><p></p><p>There is the rule of thumb of 66% of the total current demand!</p><p></p><p>which personally I would guess that your 10A circuit could be a 6A, so 66% or three 6amps is 12amps!</p><p></p><p>but in reality that is probably a tad high! because demand is NOT 66% of the mcb rating.</p><p></p><p>have a walk around your house on a few random sample evenings &amp; count how many lights are on?</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 15867, member: 250"] Lets have a look at your lighting a bit more.. 1 x 10amp, 2 x 6amp you calc'd 3.15a & 5.16a & 6.03a = 14.34. This is where the notes in the o-s-g ("intended for guidance only because it is impossible to specify allowance or diversity for every type of installation and such allowance call for specialist knowledge & experience") come in to play a bit more.. I would tend to apply the 100watt per lampholder in calculating CABLE SIZE! but use actual bulb loads to calc max demand/diversity or the circuit.. There is the rule of thumb of 66% of the total current demand! which personally I would guess that your 10A circuit could be a 6A, so 66% or three 6amps is 12amps! but in reality that is probably a tad high! because demand is NOT 66% of the mcb rating. have a walk around your house on a few random sample evenings & count how many lights are on? [/QUOTE]
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Changing the main fuse
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