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Can anyone clarify 1) is it acceptable to use a 4P rcd for a 3P+E load (FLT battery charger located outside!!) 2) how to connect test button thanks for help

Is the use of SY cable allowed on construction sites 4 off 3P 10kva site transformers which may get moved around from time to time (all located inside) fed from MDA using SY Cable because more flexible than SWA Will be using internal CPC but not sure steel braid is suitable to meet regs,even...

thanks for help, but forgot to mention SP not 3P as i also found reg on disconnection in circuit and saw it meets reg using DB mcb i have attached circuit on what is proposed. (personally i dont like it. i would rather have luminares from 3p supply) PS if 6mm connections to big for switches...

hi all a new design i am looking at uses a 5 core swa to feed 3 groups of 4 400w son lowbay luminaires,(via local jb) each phase is seperatly protected. i cannot see anything in the regs to see if this is allowed or not. (it is not easy to run singles in conduit or trunking as the route is...