stephanh Posted October 20 Share Posted October 20 starting install of Matrix treatment plant. Would like to run armoured cable in same trench as waste pipe to unit (I shall not be connecting anything - electrics are of mystical quality to me) to keep costs/time down. I have looked at calculators and 2.5mm cable comes up. Is this correct?? Link to comment Share on other sites More sharing options...
Thorfun Posted October 20 Share Posted October 20 38 minutes ago, stephanh said: starting install of Matrix treatment plant. Would like to run armoured cable in same trench as waste pipe to unit (I shall not be connecting anything - electrics are of mystical quality to me) to keep costs/time down. I have looked at calculators and 2.5mm cable comes up. Is this correct?? it all depends on the power requirements and length of cable afaik. so without that information no one can determine if the calculator you used is correct. what does your sparky say? Link to comment Share on other sites More sharing options...
stephanh Posted October 21 Author Share Posted October 21 Have not found sparks as yet (new to area) so not able to ask The unit is rated 55W/240V and cable length will be 24M Link to comment Share on other sites More sharing options...
Thorfun Posted October 21 Share Posted October 21 55W is not much. the calculator i use says that 1.5mm is fine so you should be ok with 2.5mm. BUT......i am not an electrician and am not responsible should that be incorrect. there are electricians on this forum ( @ProDave for one) so they might be able to advise better. Link to comment Share on other sites More sharing options...
Nickfromwales Posted October 21 Share Posted October 21 1.5mm would be plenty at such low consumption. 1.5 carries 18amps give or take. You need less than half an amp or so. Link to comment Share on other sites More sharing options...
SteamyTea Posted October 21 Share Posted October 21 6 hours ago, stephanh said: 55W/240V Slightly less than lightbulbs we used to fit. Link to comment Share on other sites More sharing options...
Mattg4321 Posted October 21 Share Posted October 21 Consider you might want a high level alarm/indicator at house, which would require extra core(s) potentially. Always best to run a duct with a rope through in these situations if you can. 1 Link to comment Share on other sites More sharing options...
joe90 Posted October 22 Share Posted October 22 11 hours ago, Mattg4321 said: Consider you might want a high level alarm/indicator at house, which would require extra core(s) potentially. Always best to run a duct with a rope through in these situations if you can. Yes I had an alarm fitted in the pump box but ran another cable (in duct) back to the house so the alarm was in the house (where it could he heard). Link to comment Share on other sites More sharing options...
stephanh Posted October 29 Author Share Posted October 29 you see, that is why I love these forums. Give yourself a duct and that will provide access now/later for other solutions. That one thing never even entered my brain cell. I have given such a lot of time to thinking about the various aspects of the build but simple, expedient actions have obviously failed me. I am putting this down to getting old, because I have included such things in previous builds, so why have I failed in the current one? Oh, and I have gone with 2.5mm cable. Link to comment Share on other sites More sharing options...
Thorfun Posted October 29 Share Posted October 29 4 hours ago, stephanh said: Oh, and I have gone with 2.5mm cable. in that case have you thought about running the cable to an external enclosure with a garage CU in it? you can then use that external feed to power the STP and also have another fuse free for external power sockets or driveway lights etc? might save having to run another cable in the future? 🤷♂️ Link to comment Share on other sites More sharing options...
joe90 Posted October 29 Share Posted October 29 My pump house was fed by a 2.5mm cable (in duct with alarm cable and drawrope) and a double socket one for the pump and a spare (which I used for a Strimmer etc rather than a long extension lead ). Link to comment Share on other sites More sharing options...
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