The NFC 15-100 standard is the reference that regulates low-voltage electrical installations in residential and commercial buildings in France. As part of the protection of the electrical installation and people, the standard defines 4 volumes for bathrooms and showers. Its objective is to define what is authorized in what volume (plug, switch, radiator, heated towel rail, lighting, tumble dryer, etc.). The volumes are defined from the following water points: bathtub, shower (with tray, cabin, dressing room), spa.
Regulatory volumes (NF C 15-100 part 7-701):
- Volume 0:
- The volume created by the inside of the bathtub or the shape / height of the shower tray (if there is a shower tray).
- For walk-in showers, it corresponds to the shape of the 10 cm raised shower tray. The shape is defined by volume 1.
- The hidden volume corresponds to the space under the bathtub or under the shower tray. It is not included in volume 0 although the security rules are the same.
- Volume 1:
- From the outer edges of the bathtub and rising to a height of 225 cm (from the bottom of the bathtub).
- For showers with a tray, the volume rises from the shower tray to a height of 225 cm or to the height of the shower head, if the latter is above 225 cm.
- For walk-in showers (without a shower tray), draw a circle with a radius of 1.2 m that will rise 225 cm or the height of the shower head if it is above 225 cm. The starting point of the radius of the circle follows the following rules:
- in the case of a shower head: the center of the shower head.
- in the case of the hand shower: the connection point of the hose (at the mixing valve)
- in the case of a “rain” shower: all points that make up the outer edge of the waterfall
- For showers with horizontal jets, volume 1 ends on the next wall that blocks the water jet.
- In the case of multiple sprinklers, we take all the volumes defined by each sprinkler.
- Volume 2:
- Volume from 0 to 60 cm around volume 0 and 1, up to a height of 225 cm (same height as volume 1).
- Outside Volume: the rest of the bath volume.
The NF C 15-100 standard largely complies with CENELEC’s European standard HD384 and IEC’s international standard 60364.
The equivalent in Europe: