Reasons and exclusion:
(1) Insulation damage of live parts; A 500v megohm meter can be used to measure the insulation resistance value not less than 2MQ. If less than 2MQ can strengthen the insulation of live parts.
(2) The exposed part of the live part is in contact with the shell; Remove and insulate the contact.
(3) If the ground cable is not installed or loose, reconnect the ground cable.
(4) Electrical components are damp and can be used after drying in a ventilated place.


















