Under the same load conditions,ups The backup time is mainly determined by the battery capacity and the number of battery cells. The larger the battery capacity, the longer the backup time.
During the construction process, carry out low-voltage live work ____________, should be used ____________ .
During the implementation process, corrosive operations should be used ____________ .
TN-S The three-phase unbalanced current in the low-voltage power distribution system makes the protection line PS Generate voltage to ground.