File:Extra low voltages (third safety class).JPG

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Description
English: Low voltage installations for low voltage devices. Where it's used? For example, in bathrooms or showers. Let's see them:
  • SELV or safety extra-low voltage - 12V with timer or 24V with overheating protection. In real life you also can see 12V transformers with overload protection in low-voltage halogen lamps.
  • FELV or functional extra-low voltage - 36V with overload protection and ground wire. During Soviet times it was widely used in filling stations, in Europe it is used in industrial objects with hazards.
  • PELV or protected extra-low voltage - voltage up to 48V, where one pole is grounded. Overload protection is used only near loads or other line longer than 3 meters.
All of them should have different sockets, which will allow to use devices only with related low voltage system.
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Author Dmitry G
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22 February 2011

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current18:59, 22 February 2011Thumbnail for version as of 18:59, 22 February 2011760 × 530 (58 KB)Dmitry G{{Information |Description ={{en|1=Low voltage installations for low voltage devices. Where it's used? For example, in bathrooms or showers. Let's see them: *SELV or safety extra-low voltage - 12V with timer or 24V with overheating protection. In real
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