What Size Cable for an Electric Shower?

What Size Cable for an Electric Shower?

When installing an electric shower into your commercial washrooms, one of the questions that’ll need answering is “what size cable will I need for my shower?”. The cable in question is very important, as the size of the cable used for the electric shower will dictate the type of shower that can be installed; or what kW rating of electric shower you can have (a kW rating refers to the power and flow rate of a shower).

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. However, measuring cable sizes can prove tricky, since they are measured by cross-section rather than by length or width (although they are usually stamped on the outer insulation of the cable).

With this in mind, the table below will show a range of different standard electric shower ratings and what the correct sized cable is needed to go with them. 

Cable Sizes by kW Rating

kW Electric Shower Rating

Recommended Cable Size

6000 (6kW)

6mm2

6500 (6.5 kW)

6mm2

7000 (7 kW)

6mm2

7500 (7.5 kW)

10mm2

8000 (8 kW)

10mm2

8500 (8.5 kW)

10mm2

9000 (9 kW)

10mm2

9500 (9.5 kW)

10mm2

10,000 (10 kW)

10mm2

10,500 (10.5 kW)

16mm2

11,000 (11 kW)

16mm2


Please refer to the manufacturer’s instructions for an exact guide to the size of cable you should use for your electric shower.

This article has been written in good faith as a helpful guide; please consult your manufacturer's installation manual for a full installation guide. Installation of the washroom products sold on the Commercial Washrooms website should only be carried out by fully trained and qualified tradespeople.

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