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  1. happyhippydad

    Why do we fit a 10mm cable for showers?

    I'm reading a thread at the moment about a 9.8kW shower that has been installed on a 6mm cable. My natural instinct was to think that's wrong, it should be on a 10mm. Most of us would fit a 10mm cable and believe that to be to the right choice but if the reference method is C then the 6mm has a...
  2. Jberry

    2 electric showers and melted live wire from relay

    This unit is running two showers. Unit was smoking while one shower was running, never tripped the safety switch. Power to one shower is cut off while the other is in use. Is it ok just to change out the relay that had burned? I'm not an electrician but one will be doing the work. The house is...
  3. P

    Two showers off one supply

    Some time ago I built a toilet and shower area at the end of my detached garage for use when doing outside DIY or gardening jobs instead of traipsing through the house with mucky clothes, etc. When I built this I ran a 6mm cable into the garage for the 8.5 kW electric shower through a 45 amp...
  4. D

    3 X single phase showers

    I've been asked to price 3 X 7kw showers. There is a three phase board about 40 meters away. Can anyone see an issue with 40 amp three phase MCB with 10mm four core swa to a sub board then 3 X 32 amp rcbos for each individual shower. Cheers
  5. P

    FCUs - Electricity needed for 2 Digital showers

    i have recently had one bathroom redone. A spur was taken from a plug in the airing cupboard and put into a switched FCU with a 3 amp fuse as per Mira digital installation. The second bathroom is now being done with another same digital shower next door to the other one. I am assuming I cannot...
  6. B

    Load question regarding new showers

    Evening guys I was asked a question earlier and i was unsure if my answer was correct, I was asked if I could install 3x power showers all 3 are 9.5kw I’ve been assured the water supply is more then capable, the board has a 100amp main switch My initial reaction was no, it’s way over the the...
  7. ED17

    How Many 10kw Showers?

    Last year we rewired a bungalow on a large private estate which caters for mentally ill patients. It had 5 bedrooms each with it's own wet room. The builder wanted a 10kw shower in each wet room but as the incoming sub - main was only 16swa protected by a 60amp fuse we told him no. We ended up...
  8. W

    splitting a 100 amp supply for 3 DB's

    I have been given a spec on a job from a builder and it has been suggested in the spec that we should use a 100 amp supply which is currently feeding 1 DB to split it to supply 3 DB's. So using the supply to go into a sub main board. Off this they want to supply 2 flats and a communal mobility...
  9. J

    Supply to Showerblock for glamping

    Hi guys, some friends of mine are setting up a glamping business and have asked for some advice from me regarding the electrics Farmhouse/farmshop fed from a 3phase supply. They want to set up a showerblock roughly 120m away from the incommer. Now the problem they are wanting to use 2 electric...
  10. N

    What Power of Electric Shower Can I Have with 15mm Wide Cable?

    Hello, My last builder's electrician installed wiring ready for the installation of an electric shower. It is a flatish cable about 15mm wide for the widest dimension and has "2x6+2.5mm 2" (2=squared) marked on it. When looking for an electrician to wire in a shower to it one told me that it...
  11. P

    Adding house extension(kitchen)& renovation - any tips?

    Hello all 1st post here. Just bought a house which is to be extended, and renovated. Based in Ireland, and unfortunately have no friends or family with expertise in this area. I have uploaded the house plan. The extension to the rear is a kitchen, and we will make no major alterations to the...
  12. M


    Hi, have been asked to do a conversion of a house to a B and B by a builder and am concerned on the showers, the main cut out is 100a,they already have 2 x 9.5kw (10mm t and e )showers on 63a rcd isolators and 1 x 8.5kw (6mm t and e ) shower on 40a mk mcb and want another 9.5kw fitted ...
  13. mhar

    More overload fusebox!!

    Holiday let sleeping 8+. Gas ch (combi) and cooking. 2 x Wylex rewireable cu's, pme (6mm earthing conductor!), no rcd protection. 16mm dno supply, prob 100A dno fuse, no rating on meter but likely to be 80A 1 x cu for normal (lights, rfc's) etc. 2nd cu 60A rating with 3 x 45A fuses feeding 3 x...
  14. M

    Commercial Power supply for showers

    Hi, would appreciate some advice please, I'm not a sparks. I'm dealing with a refurb on a warehouse with three WCs and a total of 6 electric showers (2 in each WC) to be installed. They're unlikely to all be used at the same time but it's possible. Also in the warehouse there is a large...
  15. S

    16mm T+E for Loft Extension, (en- suit shower. )

    Just wondering if any sparks out there would have any obligations or concerns about a proposed installation for loft conversion,, ( see drawing for details..).. Hear loads of conflicting theories about cable sizing for showers , some of them are borderline at best... and different...
  16. C

    Domestic Main fuse upgrade and associated issues

    I'm due to qualify as a domestic installer soon, and my brother, who is fully qualified, will be doing most of this work. I have a 60A main fuse. I currently have a typical domestic installation, i.e. cooker, immersion etc, and one electric shower. Due to distances between hot/cold supply and...
  17. B

    Maximum KW Shower on current set up - pics included

    I'm intending to finally refit my bathroom, first thing I want to get sorted before I start removing tiles and making a mess is the maximum KW shower I can currently install and what are my options as my current shower suggests my electrics may not be suitable for modern showers. 6mm cable The...
  18. M

    Spares / light switches from around 1966

    I have some light switches to replace in a building constructed around 1966. Theres a few broken (just worn out) although they seem like they were built to last! Steel conduit runs inside the walls & this is relied on for the earth. Unfortunately it isn't a straight swap with a modern switch...
  19. D

    Different cable rating on circuit

    Hi first post here, if during a rewire customer decides they want to keep existing 6mm cable from isolator point to shower so as not to rip up their bathroom wall (& of course keep same shower), but wants a new 10mm cable to isolator point for future use, is a fcu required between the different...
  20. J

    4 10kw showers

    Hi, iv just been asked to price a changing room with 4 10kw showers, lighting and power circuits and need some advice as normally do domestic work! What size armored would you use for a sub mains to be taken off an existing 3 phase supply at a length of 15m and would this cable need to be RCD...
  21. J

    I'm sorry for disturbing you on a saturday afternoon but ..... my showers on fire?!

    Just got in from a call out and was the best one yet. I'm sorry for disturbing you on a saturday afternoon but ..... my showers on fire?! Where do I turn the electric off in the fuse box as it's still melting? Lucky it's 30 Sec run down my road .... Went in and was met with a room full of...
  22. K


    Just done an EICR on DB03 (I've got 3 DB's) on my own property today. All was ok, no codes, only thing I did notice is I must be getting over weight as I was getting out of breath up and down stairs, back and forth to the DB. I think I'll do another DB next week lol
  23. S

    Shower supplied via 2.5 T&E

    Unbelievable!!! Last week, bathroom refurb, the shower was removed an 8.5kw mira, it had been supplied from the pullcord in 2.5mm t&e, there was no thermal damage to the cable. The customer says it was there when they moved in, 8 years ago. I cannot believe it has not caught fire & there was no...
  24. EoinConway

    Shower Priority Unit

    I've often wondered why these units don't seem to be popular in England/Scotland/Wales. They are a big big seller in the North and South of Ireland. Can you see any specific reason why they wouldn't be popular, would it be the cost or is it purely down to lack of knowledge that they're on the...
  25. P

    RCD protection or not?

    Today I went to a building approximately 15/20 years old that has had some structural & electrical renovation done this past summer. The building is to be used as a resedential home for adults with learning disabilities. I've no idea who did the electrical work but during the course of changing...
  26. F

    looking to put 4 power showers in hotel

    hi, im looking to put 4 power showers in a very small hotel, so far on the consumer unit i have b6, b6, b32, b6, b6 ,b16, b16, b32 and another b32 so i was wondering as there are another 4 spaces for mcbs could i install 4, 10.5 kw showers shower 1: has 10m horizontal run under floorboards...
  27. P

    Higher current RCD required?

    Hi, I am upgrading one of the electric showers in my house from 8.5kW to 10.8kW and I want to check weather a higher rated RCD should be installed. I currently have 2x 8.5kW showers, both connected with 10mm^2 cable and 40A MCB's and a single 80A/30mA Contactum RCD (B8003/2) in my Contactum...
  28. G

    dodgy shower

    I went to a property today to do a repair in a bathroom for a letting agent, upon entry noticed the shower cubicle had an electric shower fitted very low down, instead of the riser rail being above it, it was on the wall next to it so when the tenant ran the shower it would spray all over the...
  29. D

    8.5, 9.5 or 10.5kW Shower?

    Hi all, I'm sure this has been asked before but.... I'm just about to buy an electric shower for the annexe, water pressure is just over 1 bar, the question is, is there much difference between the 8.5, 9.5 and 10.5 kW showers in terms of temperature if your water flow is average. Thanks for...
  30. B

    Redring shower turns on when hand blender turned on!

    Hi all! I am from the plumbing forum, but thought I would ask if anyone has seen this before? I had a quick look at a Redring 9.5 expressions shower that had totally stopped, yesterday. Then the owner said it starts & pulses when his wife uses a hand blender in the kitchen! Couldn't believe it...
  31. C

    Shower interlock?

    About to do a consumer unit change and noticed that the 100a supply is feeding two electric showers. Clients say that the showers are not used simultaneously but may well be in the future. Does anyone know where to buy a 'non priority interlock' so that I can do this job properly and avoid any...
  32. A

    bonding to shower in pre-fab offices

    Hello all, Recently tested some office accomadation units for a building site (the type that come as individual bays with own db and then get bolted together to form an open plan office and all db's for each bay run back to a main db for each floor). One area had four showers supplied from...
  33. R

    Dividing showers by 240? Whaaaaa?

    It's been mentioned on here, though I don't know if it's a bit tounge-in-cheek, that showers can be divided by 240v when rating. Is this true? And if so, how come?
  34. R

    9kW shower?

    Does anyone know if any 9kW showers actually exist other than the Mira bloody Sport?! I'm really after a 9kW shower for about the £100 mark or less. Anyone got any ideas? Cheers.
  35. La Poste

    7.5KW shower with 6mm cable

    Greetings. Just had the upstairs shower die, water is leaking all over the place and it is highly dangerous. We have a 6mm cable fused at 32A at the CU with no RCD. My father is a real difficult old bloke of 85 years and whenever I try to tell him about RCD's and new fuse boards he gets really...
  36. C

    Main D/P Switch size??

    Hi all Looked at a job today and the customer is adding quite a bit onto a bungalow with 2 new extensions.My ? is, will a 100amp main switch be big enough? the new d/b will consist of: 3 x shower circuits, all showers are 10.5 kw 4 x rings 1 x water heater 4 x lighting 1 x heating
  37. S

    oven circuit required but csu already overloaded

    Hi, I have a 6kw double oven to fit and install the new circuit to supply it. No problem with cable, ccu and switch etc for the circuit. However, the consumer unit appears already to be overloaded. No spare mcbs and two showers running from it. Firstly - what is the best way to connect the...
  38. J

    Power shower wiring

    Can I connect a power shower supply to an existing circuit via an FCU or under the regs does it need a seperate circuit
  39. M

    Shower getting cooler?

    Had the shower fitted in April this year, got an on/off button and then obviously isolator. Some people are leaving the isolator switch on, will this burn the shower out because im having to turn thermostat just about on max to give a 'warm' heat. Do I need a new shower is basically the...
  40. D

    2 showers in a property

    hi all i have been to look at a job today and they are wanting 2 9.5kw showers installed there is already a cooker circuit int the property so relly only one shower wants to be working at once is there any simple way of doing this i heardd some one mention an "interlocker" or somthing dont...
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