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What are the best electrical practices in humid areas? | Legrand South Korea

What are the best electrical practices in humid areas?

Electricity and water have never been compatible, and the design of an electrical installation in wet rooms, such as a bathroom, requires particular caution because they are more exposed to risks than other rooms in the home. The NF C 15-100 standard provides recommendations on this subject.

 

 

PROTECTION VOLUMES: A CONCERN FOR SAFETY

 

For the bathroom, the NF C 15-100 standard distinguishes different types of volume, each corresponding to a level of exposure:

- Volume 0: this is the area where water is received (bath or shower). No electrical equipment is allowed in this area.

- Volume 1: it is constituted by the zone in which the water is projected around volume 0, delimited by the edges of the shower tray and/or by a height of 2,25 m. 

- Volume 2: it corresponds to a safety zone around the shower tray, on a distance of 60 cm beyond volume 1.

- The hidden volume: it is the space under the bathtub or the shower tray. No electrical equipment is allowed here (except for IPX4 products protected by a 30 mA differential switch, such as a whirlpool motor).

 

The rest of the bathroom is considered "out of volume".

 

Note: only fixed and permanent walls joined to the floor limit the volumes.

 

Volumes 0, 1 and 2

 

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Volume 0: case of walk-in showers (without shower tray)

 

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Hidden volume

 

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WHICH EQUIPMENT IN WHICH VOLUME(S)?

 

The volumes defined by the NF C 15-100 standard determine the installation of electrical circuits and devices according to their protection measure.

 

Please note: the NF C 15-100 standard requires that all electrical circuits supplying a bathroom be protected by a 30 mA differential switch. In order for this switch to play its protective role, the pipes, metal masses and lighting in the bathroom must be connected to the ground.

 

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