What circuit 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.

How many amps does a 10.8 kW shower use?

Might be worth checking the small print - marketing department like big numbers - you might find that the 10.8kW rating is at 240V rather than 230V - meaning it's rated to draw just 45A.

What amp MCB for 10.5 kW shower?

The Trician New Member. As I previously stated - a 10.5KW-rated shower will drag 45.652A or call it 47A if it is 230V-rated. If the shower is rated at 240v the current will be 43.75A.

Can I run a 10.8 kW shower on 10mm cable?

As a rule of thumb yes the cable will certainly need to be 10mm for that rated shower.

Can I fit a 10.5 kW shower?

The power of the shower is the one factor you can control when you install a new shower (but watch out for the cable size and the water pressure requirements). The flow from a 7kW shower in winter will be a disappointment for most people; a 10.5kW shower even in the depths of winter will be acceptable for most.

Cable size Circuit breaker amp size How to calculate What cable

What size MCB 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.

What rating MCB for shower?

Any shower over 8kw requires a 10mm cable. 50 amp mcb, but crucially backed up by an RCD/RCBO.

What RCD to use in shower?

For new installations, a 30 mA Residual Current Device (RCD) must be incorporated into the electrical supply to the shower in accordance with the current wiring regulations. When replacing an existing electric shower, we recommend that a 30 mA RCD is fitted if not already provided.

Why is a shower protected by a 32A MCB?

If the MCB is 32A it would limit the current anyway. If the shower is on High setting it will use 8.5kw to heat the water to temperature set point whether it's on 1 or 10. An Mcb will not limit current. Other than when it trips then it will limit it to Zero.

What fuse do I need for a 10kw 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.

Does a shower need to be RCD protected?

Electric Showers

All circuits in a bathroom must be protected by a RCD (Residual Current Device). They will need to be connected to the consumer unit and protected by an RCD.

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

"Hi, a 9.8kW shower would require a minimum of 10mm cable supplying it, with a 45A breaker from the consumer unit.

Can you spur off a shower circuit?

yes! off the load side of shower DP switch!

What size MCB for 9.5 kW shower?

If the shower is rated at 9.5Kw at 240V then based on the nominal voltage of 230V the shower would work out at about 37.95A. At 240V it comes to just under 40A so the 40A OCPD is fine.

What size MCB for 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.

Does an electric shower need an isolator switch?

Yes you do need a shower isolator switch Spike..

What power can a 6mm cable take?

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). On the boarder though, which got me thinking. Does the cable rating have to be able to take the extra amperage that a 50A MCB needs before it trips.

What is the most powerful electric shower?

A 10.8kw electric shower is the most powerful electric shower there is and it means that it will provide improved pressure and a higher water temperature.

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.

How much electricity does a 10kw shower use?

A 10 kW shower uses approximately one kWh of energy in six minutes.

Can 6mm cable take 40 amps?

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.

Do power showers use a lot of electricity?

The electric shower is generally more efficient and cheaper to run with less water being wasted; however, you risk spending extra on your electricity bills if you're on a high tariff.