* Make sure the distances between live part and metal part of LED troffer can satisfy reinforced or double insulation. * The luminaire should only be installed by a qualified electrician. * Before installation and maintenance of the LED troffer, please disconnect the power to prevent electric shock. * Before installation and maintenance, LED troffer must be operated by professional and technical personnel, non-professionals do not to remove the light . * The LED troffer must be installed in an appropriate environment to work. In harsh environments may shorten the life or even damage the light . * For type Y attachments:If the external flexible cable or cord of this luminaire is damaged,it shall be exclusively replaced by the manufacturer or his service agent or a similar qualified person in order to avoid a hazard.