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

Extra_low_voltages_(third_safety_class).JPG ‎（760 × 530 像素，檔案大細：58 KB ，MIME類型：image/jpeg）

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描述
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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來源 自己作品
作者 Dmitry G
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22 2 2011

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現時2011年2月22號 (二) 18:59響2011年2月22號 (二) 18:59嘅縮圖版本760 × 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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