WTA: pulling new cable for kitchen hob
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 Mar 15 2023, 01:45 PM
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#1
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Junior Member
249 posts Joined: Mar 2010 
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2 set of 2.5mm.sq is common. Mostly done to reduce cost as 4mm.sq cable are very expensive (and you need to buy at least 2 color for the live and neutral, earth can use 2.5mm.sq green).
6mm.sq overkill for 5kW load. No need for that. |
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Mar 15 2023, 02:25 PM
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#2
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Junior Member
249 posts Joined: Mar 2010
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QUOTE(mushigen @ Mar 15 2023, 01:55 PM) Understand that 6mm² is overkill. Cable quality aside, what's the usual guideline on the max current 4mm² wires can take? Cable laying labour cost should be the same, we can fit 6x2.5mm.sq in a 3/4 inch conduit (Or use 1 inch, cost difference is negligible). We pull them in one go, not each separately. Use only quality cable by the way. (Something like Mega Kabel brand)Also, do we use 220, 230 or 240V in calculation of current vs wattage? Is 2x2.5mm² laying cost (material plus labour) cheaper than 4mm²? With 4mm², only need to pull 3 wires vs 6 for 2.5mm² per my conversation with the contractor.  For calculation, you should use 230V. 4mm.sq according to Mega Kable spec sheet are rated to carry 32amp of current (~7.6kW). edit: 4mm.sq circuit will cost more than 2.5mm.sq (labour+cost). Do note that your usual 13A plug socket are actually ring topology (6x 2.5mm.sq). This post has been edited by marvinben: Mar 15 2023, 02:27 PM |
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