Which electrical standards apply to a whirlpool bathtub?
A whirlpool bathtub combines two elements that leave no room for approximation: water and electricity. Its installation is therefore governed by a precise regulatory framework, particularly the NF C 15-100 standard for rooms containing a bathtub or shower. This guide covers the key points you need to know before undertaking an installation project.
This content is provided for information purposes only and does not replace the intervention of a qualified professional: the electrical connection of a whirlpool bathtub must be carried out or approved by an electrician.
The regulatory framework: two complementary standards
The NF C 15-100 standard governs the electrical installation of any room containing a bathtub or shower: it defines safety zones around the water source, with different rules depending on the distance from the water.
Bathroom safety zones
The NF C 15-100 standard divides the area around a bathtub into several zones, each with its own rules.
| Zone | Definition | Permitted electrical equipment |
|---|---|---|
| Zone 0 | Inside the bathtub | Virtually none, except 12 V SELV IPX7 lighting, with the transformer located outside the zone. |
| Zone 1 | Located vertically above the outer edge of the bathtub, up to a height of 2.25 m from the finished floor. | Very limited IPX5 equipment: water heater with connection box outside the zone, 12 V SELV lighting with transformer outside the zone. |
| Zone 2 | Located 0.60 m around Zone 1, with the same upper limit of 2.25 m from the finished floor. | Class II equipment with IPX4. Certain Class I equipment, such as water heaters, and Class II equipment, such as heating or lighting, may be permitted depending on the circumstances. |
| Concealed zone | Space beneath the bathtub, accessible only through an access hatch or a removable panel that requires a tool. | Prohibited, except for a specific exemption applicable to approved whirlpool bathtubs. |
| Outside the zones | Rest of the room. | Standard installations, with no specific restrictions related to the safety zones. |
The special case of the whirlpool bathtub: the concealed zone
This is the point that is most specific to whirlpool bathtubs. Under normal circumstances, no electrical equipment is permitted in the concealed zone, meaning the space beneath the bathtub. However, the EN 60335-2-60 standard provides an exception: the motor and water circulation equipment of an approved whirlpool bathtub may be installed there, provided that this space can only be accessed using a tool, through an access hatch or removable panel, and can never be freely accessed by hand without a tool.
In practical terms, this means that on a certified whirlpool model, the motor may be housed beneath the tub, provided that the bathtub panel or access hatch remains securely attached and can only be opened using a tool.
What the standard requires for the electrical connection
- A dedicated circuit: ask a specialist installer for advice to determine whether your equipment requires a dedicated circuit depending on its power rating and the manufacturer's recommendations.
- A high-sensitivity 30 mA residual-current device, combined with a circuit breaker suited to the power rating of the equipment.
- Equipotential bonding, connecting all metal pipework and the bathtub frame, if it is made of metal, to earth.
- A compliant connection of the live, neutral and earth conductors, with no approximation whatsoever in the wiring.
Who should carry out the installation?
Given the risks associated with electricity in wet environments, it is strongly recommended that the electrical connection of a whirlpool bathtub be carried out or, at the very least, approved by a qualified electrician. This is particularly important for a new installation or a complete renovation of the bathroom's electrical circuit.
Find out more
To learn everything about the power consumption and actual running costs of a whirlpool bathtub, read our guide to electrical consumption. To choose your model, discover our range of whirlpool bathtubs.
Frequently asked questions
1. Can the motor of my whirlpool bathtub really be installed beneath the bathtub?
Yes, provided that the space beneath the tub, known as the concealed zone, can only be accessed using a tool and that the bathtub is certified as complying with the EN 60335-2-60 standard. This is a specific exception for approved sanitary equipment such as whirlpool bathtubs.
2. Is a dedicated residual-current device mandatory?
Yes, a high-sensitivity 30 mA residual-current device is required on the circuit supplying a whirlpool bathtub. It must be combined with protection suited to the power rating of the equipment and installed in accordance with the manufacturer's recommendations.
3. Can you install the electrical connection of a whirlpool bathtub yourself?
Installing the bathtub itself is within the reach of an experienced DIYer, but the electrical connection must be carried out or approved by a qualified professional. We recommend hiring an electrician for the electrical installation of your whirlpool bathtub.
