First of all , the LED ceiling light is generally installed where the air convection conditions are good in order to achieve sufficient cooling effect, keep the housing of the radiator unobstructed so that the heat timely spread out through the housing .
Second, the metal shell and the power line and the shell of the LED ceiling light should be connected to ground (FG)，the reliable grounding is to ensure safety , do not mistakenly connected the shell to the zero line.
Third, please check on each terminal connection of the LED ceiling light again before running, don’t energize the LED ceiling light until make sure the input and output , AC and DC , single phase and multiphase , positive and negative , the voltage and current values are undoubtedly correct.
Fourth, the Department of leakage current: when multiple power supplies are used, all of which intake the same ground , the total leakage current is composed by the sum of the leakage current of each unit, then to check the reliability of protective grounded line and whether the grounded resistance achieve requirements，in case of being electrical shock .
Five , for the switching power supply of high-power LED ceiling light and LED Downlight, there are generally two or above the ” +” input terminal and ” – ” output terminal , in fact they belong to an output electrode , just to allow users easy wiring and the plurality of terminals are connected internally.
Six , for symmetry with dual output load , the preferred symmetrical output power .
Seven , LED switching power supply add the resistive load previously factory , for use in capacitive or inductive the load，which should be described in the order in advance.
Eight , the defined input power of AC input power = output power / ( input voltage * power factor * efficiency )
Above all , for the users whose FG is not grounded, the hemp feeling is normal when touch housing or output power of the LED ceiling light , there is 110V AC output when the FG floating around the earth, which is determined by the internal structure of the power of the LED ceiling light.
Just browsing http://www.lead-lighting.com for more practical use and characters of the LED ceiling lights and other LED light
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