Peak current coefficient (CF) : The peak current coefficient is the ratio between the peak value of the current cycle waveform and the effective value. Since the energy absorbed by the computer load does not necessarily follow the sinusoidal law when it receives the sinusoidal voltage, it will produ......
Read MoreNoise (electrical line noise) : refers to radio frequency *(RFI) and electromagnetic *(EFI) and other high frequency *, motor operation, relay action, motor controller work, broadcast emission, microwave radiation, and electrical storm, will cause noise.Frequency variation (frequency variation) : re......
Read MoreFire smoke exhaust fan, mainly refers to the smoke exhaust fan applicable to the fire field. Because in use, the fan has strict fire protection requirements: 1, the factory fans need to have the Ministry of Public Security fire 3C certification logo; 2. The project information applied by the fan s......
Read MoreAccording to the national standard of "Fireproof Valves for Building Ventilation and Smoke Exhaust Systems GB15930-2007", Henan Shuangxin will explain to you how the standard fire protection 3C fire valve is marked and packaged and stored.
Read MoreIn the ventilation and air conditioning systems of industrial and civil buildings and underground buildings, fire dampers are a common fire protection product; and 3C fire dampers are the fire protection requirements for fire damper products under the premise of considering fire safety.
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