rocketboy2 Posted August 23, 2023 Share Posted August 23, 2023 Hi Need some advice. I need to upgrade my two showers from 4500wt To 6000 wt units. I was going to upgrade the wiring to 4mm square. 3 singles in yellow pipe. From the old 2.5. square in yellow pipe. Plus a new RCBO breaker 32 amp Schneider type. Now the new shower unit is going to be a sharp SHARP WH-X HOT6 ( not bought yet) But looking at the installation manual. It states use 6mm square wire double insulated. My run max length will be 10meters max, do I really need 6mm square double insulated wire.? I’m not an electrician so unsure. Don’t want to try and get 6mm wire down a tube in a wall if I can help it. Any help would be great. Thanks. Link to comment Share on other sites More sharing options...
Popular Post Crossy Posted August 23, 2023 Popular Post Share Posted August 23, 2023 No, if in conduit the conduit is the "double". Just use regular 6mm2 THW and you're good to go. EDIT For normal people 4mm2 THW would be OK for a short run. If you have teenagers go with the 6mm2???? Do ensure that you have a good earth connection to the heater!! 3 Link to comment Share on other sites More sharing options...
rocketboy2 Posted August 23, 2023 Author Share Posted August 23, 2023 9 minutes ago, Crossy said: No, if in conduit the conduit is the "double". Just use regular 6mm2 THW and you're good to go. Do ensure that you have a good earth connection to the heater!! Ok, Thank you, I will use yellow pipe and 6mm wire. 1 Link to comment Share on other sites More sharing options...
rocketboy2 Posted August 23, 2023 Author Share Posted August 23, 2023 15 minutes ago, Crossy said: EDIT For normal people 4mm2 THW would be OK for a short run. If you have teenagers go with the 6mm2???? is 10 meters a short run ? Link to comment Share on other sites More sharing options...
Crossy Posted August 23, 2023 Share Posted August 23, 2023 10 minutes ago, rocketboy2 said: is 10 meters a short run ? Yeah, if it was >20m I'd be thinking a bit. But for an intermittent load like a shower ... Unless, you have teens!!! 1 Link to comment Share on other sites More sharing options...
rocketboy2 Posted August 23, 2023 Author Share Posted August 23, 2023 (edited) 2 minutes ago, Crossy said: Yeah, if it was >20m I'd be thinking a bit. But for an intermittent load like a shower ... Unless, you have teens!!! Ok, thank you. 4mm, it is. No teens anymore. Edited August 23, 2023 by rocketboy2 1 Link to comment Share on other sites More sharing options...
KannikaP Posted August 23, 2023 Share Posted August 23, 2023 (edited) I had 3.5 kw Panasonics fitted 12 years ago. I don't think they have ever been in the red part of the dial. The sparky who fitted them put them on the same circuit as the rest of the bedroom, earthed of course. Not had any circuit breakers break yet or any cables go up in smoke. Edited August 23, 2023 by KannikaP Link to comment Share on other sites More sharing options...
Crossy Posted August 23, 2023 Share Posted August 23, 2023 5 minutes ago, KannikaP said: I had 3.5 kw Panasonics fitted 12 years ago. I don't think they have ever been in the red part of the dial. The sparky who fitted them put them on the same circuit as the rest of the bedroom, earthed of course. Not had any circuit breakers break yet or any cables go up in smoke. Yeah, at 17A they would be OK (but not recommended) particularly as most bedroom kit is low power. https://hitachi-magic-wand-massagers.co.uk/pages/magic-wand-massager Now someone will be along who runs a welder in the bedroom. There's no accounting for those kinks!! 1 Link to comment Share on other sites More sharing options...
rocketboy2 Posted August 24, 2023 Author Share Posted August 24, 2023 21 hours ago, Crossy said: No, if in conduit the conduit is the "double". Just use regular 6mm2 THW and you're good to go. EDIT For normal people 4mm2 THW would be OK for a short run. If you have teenagers go with the 6mm2???? Do ensure that you have a good earth connection to the heater!! I made a slight mistake today. I bought BCC 60227 IEC 01 (THW ) 1 x 6 sq mm, 7 strand wire. didn't notice it was not a solid 1 core cable ? Will it still be ok to use for 6000wt shower. ? or should i go back and try change it. ? Link to comment Share on other sites More sharing options...
Crossy Posted August 24, 2023 Share Posted August 24, 2023 No, that will be fine, easier to get into your pipe ???? Rating is the same as the solid. 1 Link to comment Share on other sites More sharing options...
brianthainess Posted August 24, 2023 Share Posted August 24, 2023 Hi Crossy, just wondering while on the subject, an old friend of mine a qualified industrial electrician, once told me that if the shower units aren't earthed, you will not get hot water, is this so? Link to comment Share on other sites More sharing options...
rocketboy2 Posted August 24, 2023 Author Share Posted August 24, 2023 1 hour ago, Crossy said: No, that will be fine, easier to get into your pipe ???? Rating is the same as the solid. Thank you Crossy, that's great Link to comment Share on other sites More sharing options...
Crossy Posted August 24, 2023 Share Posted August 24, 2023 1 hour ago, brianthainess said: Hi Crossy, just wondering while on the subject, an old friend of mine a qualified industrial electrician, once told me that if the shower units aren't earthed, you will not get hot water, is this so? Some units will refuse to heat if no earth, but I've not seen one here. It's possible that your national regs. require this function. Link to comment Share on other sites More sharing options...
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