Air-cooled air conditioners and air-to-air heat pumps. Testing and calculating methods for seasonal performance factors. Part 2. Heating seasonal performance factor
Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz. Part 2-3. Immunity requirements for mains communications equipment and systems operating in the range of frequencies 3 kHz to 95 kHz intended for use by electricity suppliers and distributors
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