Inappropriate drilling will damage the device inside the cabinet. Metal debris generated by drilling enters the cabinet will lead to PCB short circuit.
So it needs to put the UPS aside long time(≥10 min)
the UPS chassis could be opened after charge released.
It is dangerous to operate under lightning storm!
Operation under high voltage and AC operation is prohibited during a lightning storm or in the tower or the mast operation. During a lightning storm, the atmosphere will produce a strong electromagnetic field. Therefore, in order to avoid of equipment struck by lightning, lightning protection should be grounded timely
lightning protection should be grounded timely
be careful of static
To prevent static damage sensitive components, make sure that you are wearing a wrist strap before contact with sensitive components (such as the flapper, circuit boards, IC chips, etc.), also the other end of wrist strap is well grounded.