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Is 6mm cable OK for 9.5 kW shower?

Author

Andrew Vasquez

Updated on February 23, 2026

Is 6mm cable OK for 9.5 kW shower?

9.5kW is either 39A or 41A depending on the voltage it is rated at. 6mm cable is 47A when installed in the most favourable conditions. So 6mm could be used, depending on how it is installed. However it would be usual to use 10mm which would allow the fitting of a higher rated shower either now or in the future.

Thereof, how many kW can a 6mm cable carry?

Well 6mm tandE takes 47A IF clipped direct, and not to0 long of a run, say about 10-15meters. That means that 6mm is ok for 10.5KW showers (SOMETIMES).

Additionally, can you replace a 8.5 kW shower with a 9.5 kW? The 9.5kW shower draws 41A if you use 230v, but as most supplies are 240v it will draw below 40A. I would go with the 9.5 kW shower, the cable will not be loaded for long periods and it is not a long run. If you are concerned, check the VD with a meter when the shower is running.

Then, can you run a 9kW shower on 6mm cable?

Just use the existing 6mm cable for the 9kW shower. Your customer won't have the slightest problem with it - unless he's rich enough to spend all weekend in the shower.

How many amps is a 9.5 kW shower?

fuze-box New Member. As long as your breaker is 40amp it will be ok, because your shower will take 41.3amps (roughly 4 amps per kw) at full load and that will only be for about 15mins, the cable is rated at 48amps anyhow.

Can 6mm take 40a?

40A is too high for 6mm, should be 32A. Also the length of the cable run has a big impact on whether 6mm is a big enough cable..! Its generally ok but can struggle for long runs.

What is the maximum load for 6mm cable?

Now the regulations allow for a 145% increase in current carrying capacity for 1 hour to allow for the MCB tripping so using a 6mm for a maximmum load od 32A with a 32A MCB is acceptable. Using a 32A MCB to protect a 6mm cable with a maximum load of over 50A is not.

What size cable does a 9.5 kW shower need?

9.5kW is either 39A or 41A depending on the voltage it is rated at. 6mm cable is 47A when installed in the most favourable conditions. So 6mm could be used, depending on how it is installed. However it would be usual to use 10mm which would allow the fitting of a higher rated shower either now or in the future.

What is 6mm cable used for?

Best Electrical Twin & Earth Grey Wiring Cable - 6mm. The Best Electrical Twin & Earth Grey - 6mm is a standard house wiring cable with a grey PVC outer sheath. This type of cable is mainly used for sub mains applications. Cable size is 6mm.

What current can 4mm cable carry?

37 amps

Whats the difference between a 8.5 kW and a 9.5 kW shower?

There are typically three different power ratings available in electric showers, 8.5kW, 9.5kW and 10.5kW. The cheapest to run and to purchase are the 8.5kW. So electric showers, 8.5kW rated will have less power and the water will need to pass slower (less pressure) past the heating element the hotter you want it.

Is a higher kW shower better?

Most people associate a higher kW rate with a better shower. The higher power means a consistently greater flow of water at your selected temperature which can give a real luxury experience.

Can I replace a 7.5 kW shower with a 8.5 kW?

Well, assuming the circuit is satisfactory and compliant now then you can change to an 8.5kW shower. The cable does look a bit small and smaller than those in the shower but it may be alright.

Can I use 6mm cable for a 8.5 kW shower?

6mm cable, depending on the run, is likely to be fine for an 8.5kW shower. Rcd protection is helpful, but bonding and cross bonding are far more important. And a 30a breaker, fuse wire wouldn't pop for overload either as it's unlikely to be overloading long enough.

What cable is needed for 10kW shower?

Common Shower Ratings and Protective Devices
Standard Shower Rating Watts (kW)Maximum load from the supply AmpsRecommended Minimum Cable Size to be Used
9000 (9kW)39.1310mm2
9500 (9.5kW)41.310mm2
10,000 (10kW)43.4710mm2
10,500 (10.5kW)45.6516mm2

What is the difference between a 9.5 kW shower and a 10.5 kW shower?

8.5kW, 9.5kW and 10.5kW all exist because of another important aspect of showers, pressure. Higher powered electric showers have been introduced to combat this issue, so a higher power 10.5kW shower will be able to run at higher pressure at higher temperatures than 8.5kW electric showers.

What size cable do I need for a 10.5 kW shower?

2) 6mm T&E cable installed covered by 100mm insulation the maximum current carrying capacity is only 34A. so straight away it is clear the cable is undersized (needs to be at least 10mm).

What size fuse do I need for a 8.5 kW shower?

The Right Fuse for Your Electrical Shower
Kilowatt RatingFuse Size
7.5 kW40 amperes
8.5 kW40 amperes
9.0 kW40 amperes
9.5 kW40 amperes

Is a 10.5 kW shower powerful?

The massive benefits to electric showers are, of course, you don't need hot water in your system. Higher powered electric showers have been introduced to combat this issue, so a higher power 10.5kW shower will be able to run at higher pressure at higher temperatures than 8.5kW electric showers.

What size cable do I need for a 32 amp supply?

32 & 40 AMP electrical requirements
For a 32AMP hot tub, 6mm² 3-core SWA cable is needed and a 10mm² 3-core SWA cable is perfectly suitable for a 40AMP Hot Tub. An IP65 45AMP Rotary Isolator Switch is also recommended so that the hot tub can be isolated outdoors in an emergency or for service work.

Is a 7.5 kW shower any good?

7.5kW and 8.5kW shower rates require less power so the gentler flow of water will mean your shower is unlikely to ever run cold. What's more, they're usually cheaper models to purchase and run. If you're okay with a gentler flow of water as the temperature rises, you can stick with this model.

What does a higher kW shower mean?

In turn, this means the more powerful the shower, the greater the flow of water at your desired temperature. Simply put, if you want hotter water at a higher pressure, you'll need a higher power, and a higher kW rating. The choices. 7.5kW and 8.5kW electric showers.

What does kW mean in showers?

kilo-watt

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