What size fuse do I need for an electric shower?

Fuses and switches should be rated at 32 amps. Showers up to 9kw may carry a 6mm cable as long as the shower unit is within 18 meters of the fuseboard. Fuses and switches should be rated at 40 amps.

What size fuse do I need for a 9.5 kW shower?

The Right Fuse for Your Electrical Shower

Kilowatt Rating Fuse Size
8.5 kW 40 amperes
9.0 kW 40 amperes
9.5 kW 40 amperes
9.8 kW 45 amperes

What fuse do I need for a 10.5 kW shower?

The shower is currently protected by a 32A mcb which is protected along with other circuits by an rcd for the consumer unit. The cable size is 6mm.

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What size breaker do I need for a 7.5 kW shower?

I believe that the recommended fuse rating for a 7.5kw shower is 32amp. Using a 30amp fuse could give you problems.

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What size breaker do I need for a 9.8 kW shower?

2 Answers from MyBuilder Electricians

a 9.8kw load is around amps (9800watts divided by 230volts = 42.6 amps), so ideally a 45amp BSEN60898 MCB or a BSEN61009 RCBO (if your existing fuseboard does not have RCD protection), should be used.

How many amps does a 10kw shower use?

Depends on the exact voltage at the location, could be anywhere between 39- 42 amps in reality.

Can I fit a 9.5 kW shower 6mm cable?

You could get away with a 6mm cable for a 9.5kW shower.

What size breaker do I need for a 10.8 kW shower?

When replacing a 9.5kW electric shower with a 10.8kW, the MCB tips out each time it’s used. Why is this? First, check the MCB current rating; a shower of this kilowatt rating should have a 45 amp.

Can I run a 10.5 kW shower on 10mm cable?

The higher the kW rating of a shower, the greater the flow of heated water from the showerhead will be; so making sure to get the right size cable for your electric shower is vital.

Cable Sizes by kW Rating.

kW Electric Shower Rating Recommended Cable Size
10,000 (10 kW) 10mm2
10,500 (10.5 kW) 16mm2
11,000 (11 kW) 16mm2

What breaker should a shower be on?

Normally for a shower it woul be a 40 or 45amp fuse/circuit breaker. 9000watts divided by 230volts = just over 39 amps. Its also worth checking that you have an RCD (redisual current device) fitted, as all showers must now be RCD protected.

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

An 8.5kW shower draws a current of 35.5A. So, you need an MCB higher than this value. Next size up is 40A.

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Can I use 6mm cable for a 7.5 kW shower?

A 7.5kw shower can be supplied using a 4mm cable, but for 8.5kw, you will need at least 6mm cable.

Are 7.5 kW showers any good?

7.5kW and 8.5kW electric showers

If your household hosts a smaller water tank or an unreliable water supply, this range of kW rates will probably suit you best. 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.

Can you get a 7kw shower?

If “pressure” (flow) is OK on cold setting (even if head is as low as you say), then unlikely to be a restriction in supply (as same single water feed). 7 kw really is very borderline for a decent shower, particularly in the winter months when the water supply temperature is so much colder).

Is a 9.5 kW shower powerful?

If you don’t mind a low flow of water then you’ll be happy with a lower kW rating such as 7.5kW or 8.5kW; such as the Triton and Mira options above. If you’re a shower user looking for a greater rate of water from your shower you’ll be better off buying a 9.5kW or 10.5kW electric shower like the Bristan examples below.

Can a 6mm go on a 40A MCB?

6mm, ref method 1 is good for 47A. So it is possible to protect it with a 40A CB, although a close eye on grouping, insulation, volt drop etc would be prudent.