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rules of thumbs for lighting circuits
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 20178" data-attributes="member: 250"><p>although your current carrying capacity, (clipped direct with no thermal insulation or grouping or other correction factors), may be ok......</p><p></p><p>Don't think you will satisfy max permissible volt-drop. 3% on lighting circuits =<em><strong>6.9v max</strong></em>.</p><p></p><p>1.0mm = 44mv/A/m</p><p></p><p>Allow general 66% total load for diversity.. so 1800watt becomes 1200watts</p><p></p><p>so 1200watts @ 230v = 5.22a and</p><p></p><p>Voltdrop = (44 x 5.22 x 35m)/1000 = <strong>8.03volts</strong>? Too high</p><p></p><p>stick it on 1.5mm 29mv/A/m drops to <strong>5.29volts</strong> sneaks in ok! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /> </p><p></p><p>OR say max load is call it 1300watts?</p><p></p><p>with Diversity approx 870watts = 3.78amps</p><p></p><p>So with our 1.0mm Volt drop now = (44 x 3.78 x 35)/1000 = <strong>5.82volts</strong> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>So either.. Drop your loading OR increase cable CSA! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>Remember the acceptable volt drops have changed with 17th..</p><p></p><p>old used to be 4% on all circuits... Lights now only 3%!! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> :|</p><p></p><p>Appendix 6 OSG covers these bits! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 20178, member: 250"] although your current carrying capacity, (clipped direct with no thermal insulation or grouping or other correction factors), may be ok...... Don't think you will satisfy max permissible volt-drop. 3% on lighting circuits =[I][B]6.9v max[/B][/I]. 1.0mm = 44mv/A/m Allow general 66% total load for diversity.. so 1800watt becomes 1200watts so 1200watts @ 230v = 5.22a and Voltdrop = (44 x 5.22 x 35m)/1000 = [B]8.03volts[/B]? Too high stick it on 1.5mm 29mv/A/m drops to [B]5.29volts[/B] sneaks in ok! :D OR say max load is call it 1300watts? with Diversity approx 870watts = 3.78amps So with our 1.0mm Volt drop now = (44 x 3.78 x 35)/1000 = [B]5.82volts[/B] :) So either.. Drop your loading OR increase cable CSA! ;) Remember the acceptable volt drops have changed with 17th.. old used to be 4% on all circuits... Lights now only 3%!! :o :| Appendix 6 OSG covers these bits! :D [/QUOTE]
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