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.