How to Wire a Shower Switch

By Ben Victor

Updated: 16th August 2023

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Wiring a shower switch might seem like a daunting task, but with the right tools and knowledge, it can be a fairly straightforward DIY project.

Whether you’re dealing with a pull cord switch or another type, this guide will walk you through the process step by step.

How to Wire a Shower Switch — Credit: @UTech UReview

Understanding Shower Switch Types

Before diving into the wiring process, it’s essential to understand the different types of shower switches available:

Shower Switch Amp Types

6 Amp: These are typically used for light-duty applications, such as controlling bathroom lights or extractor fans. They are not suitable for electric showers due to their low amperage rating.
32 Amp: This is a common rating for many standard electric showers. Showers with power ratings up to around 7.5 kW usually require this switch.
40 Amp: These switches are designed for slightly more powerful electric showers, typically those with power ratings between 7.5 kW and 8.5 kW.
45 Amp: This is one of the most common ratings for electric shower switches. Showers with power ratings up to 10.5 kW usually require a 45 Amp switch. Some of these switches come with an integrated neon light or on/off indicator.
50 Amp: For high-power electric showers, especially those above 10.5 kW, a 50 Amp switch might be necessary.

Shower Switch Activation Types

Pull Cord Switch: This is the most common type, especially in bathrooms. It’s mounted on the ceiling with a cord hanging down, allowing users to turn the shower on or off by pulling the cord.
Wall-mounted Switches: These are more modern and can be touch-operated or have a traditional flip mechanism. They’re often used in contemporary bathroom designs.

What size cable do I need?

Selecting the right cable size for wiring a shower switch is essential for both safety and efficiency. Cable sizes, typically measured in square millimetres (mm²), vary based on the shower’s power rating and the distance from the shower unit to the consumer unit. For instance:

For showers up to 7kW, a 6mm² cable is generally suitable for distances up to 18 meters.
Showers between 7kW and 8.5kW might require a 6mm² cable for shorter runs (up to 10 meters) and a 10mm² cable for longer ones.
High-powered showers above 8.5kW often necessitate a 10mm² cable, especially for extended cable runs.

It’s crucial to refer to the manufacturer’s guidelines for specific recommendations. If uncertain, consulting a certified electrician ensures both optimal performance and safety, as an undersized cable can lead to overheating and potential hazards.

Shower Switch Wiring Preparation

Please note: it is always recommended that you hire a qualified electrician to handle any electrical work.

Equipment You’ll Need

Flat blade screwdriver
Philips screwdriver
Replacement shower switch (6 amp to 50 amp, depending on your needs)
Replacement pull cord (if you’re only replacing the cord)
Scissors (for adjusting cord length)
Ladder or step stool
Safety gloves and goggles

Safety First!

Before starting any electrical work:

Isolate the Circuit: Ensure the electricity is turned off for the circuit you’ll be working on. This can be done by switching off the MCB (Miniature Circuit Breaker) for that specific circuit.
Leave a Note: Place a note over the MCB to inform others that you’re working on the circuit.
Stay Dry: Ensure your hands and the environment are dry. Bathrooms can be damp, so double-check for any water sources nearby.

Step-by-Step Guide to Wiring a Pull Cord Shower Switch

Preparation: Set up your ladder right below the switch. Ensure it’s stable.
Access the Wires: Unscrew the switch from its back plate. Gently pull it out to see the wires. It’s a good idea to take a photo for reference.
Identify the Wires: Depending on your home’s age, wire colours might vary. Typically, newer homes have brown (live) and blue (neutral) wires, while older homes might have red (live) and black (neutral).
Connect the New Switch: Attach each wire to the correct terminal on the new switch, referring to your photo. Ensure the connections are secure by gently tugging on the wires.
Refit the Switch: Align the switch with the back plate and screw it back in place.
Test: Turn the MCB back on and test your shower switch.

Final Thoughts

Wiring a shower switch doesn’t have to be a challenge.

With the right tools and precautions, you can ensure a safe and successful installation.

However, if you ever feel uncertain, it’s always best to consult with a professional electrician.

Remember, safety first and happy DIY-ing!

Frequently Asked Questions

What switch do I need for an electric shower?

For an electric shower, you’ll typically need an isolator switch that can handle the power rating (kW) of your shower. This switch allows you to safely isolate the power to the shower for maintenance or in case of an emergency.

Related: 45a or 50a Shower Switch?

Where do you put a shower isolator switch?

A shower isolator switch should be placed outside the bathroom, usually on a wall or in a location that’s not directly reachable from the shower. This ensures safety, preventing someone from touching the switch with wet hands.

Is it safe to wire a shower switch myself?

While many DIY enthusiasts can wire a shower switch, it’s essential to have a good understanding of electrical systems and to follow safety precautions. If you’re unsure or unfamiliar with electrical work, it’s always best to consult or hire a certified electrician.

What amperage switch do I need for my electric shower?

The amperage of the switch you need depends on the power rating of your electric shower. For example:

Up to 7.5 kW: 32 Amp switch
7.5 kW to 8.5 kW: 40 Amp switch
Up to 10.5 kW: 45 Amp switch
Above 10.5 kW: 50 Amp switch
Always refer to the manufacturer’s guidelines for your specific shower model.

How do I know if my shower switch is faulty?

Signs of a faulty shower switch include:

The shower not turning on when the switch is activated.
A burning smell or visible signs of scorching around the switch.
The switch feels unusually hot to touch.
Flickering lights or intermittent power when the shower is in use.
A buzzing or humming sound from the switch.

Can I replace a pull cord switch with a wall-mounted one?

Yes, you can replace a pull-cord switch with a wall-mounted one. However, you’ll need to ensure that the wall-mounted switch is appropriately rated for the electric shower’s power and that it’s installed in a safe location, away from direct contact with water.

How often should I replace or check my shower switch?

It’s a good practice to inspect your shower switch annually for any signs of wear, damage, or malfunction. Depending on usage and quality, a shower switch can last many years. However, if you notice any irregularities or if the switch is over a decade old, consider replacing it to ensure safety and optimal performance.