Must outdoor lighting fixtures be protected by RCD?

[Students' questions] Should outdoor lighting fixtures be protected by RCD?

[Answer] (1) For urban road lighting, the “City Road Lighting Design Standards” CJJ45-2006 should be implemented. Whether they are equipped with RCD should consider the power supply system power supply, grounding resistance value and short-circuit sensitivity. determine.

(2) Building landscape lighting, can carry out the "Electrical Design Code for Civil Buildings" JGJ16-2008 Article 10.9.3.3, that is, "(Building Landscape Lighting) outdoor branch line should be equipped with residual current action protector".

RCD is prone to false tripping and its solution, nothing more than two types:

(1) The normal leakage current of the lighting circuit is too large. In this case, double insulated cables can be used, products with high degree of protection can be selected or the length of the line can be shortened, and the number of lamps installed in the circuit can be reduced.

(2) The RCD's own leakage current rating is incorrectly selected. If the RCD is used as an additional protection or indirect contact protection for direct contact protection, the residual operating current should not exceed 30 mA; if the RCD is only used to improve the short circuit sensitivity of the circuit, the RCD rating can be selected to be more than 30 mA.

The above contents are compiled according to the problems encountered by the students in the actual work, for reference, if there is any problem, please communicate and correct in time.

Edit: liuhai

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