Technical FAQs 4

What happens if a grounded user touches a battery terminal?

The concern is that, if a grounded user touches a battery terminal, there is a direct path back to through the rectifier/charger semiconductors to the UPS ac input voltage, (or through the inverter to the UPS ac output voltage). Some UPS designs “float” the battery system, using transformers on both the UPS input and the UPS output.

How does an UPS system work?

The UPS system and the battery cabinet operates with mains, batteries or bypass power that carry high currents and voltages. The properly installed UPS system and battery cabinet is grounded to earth and NEMA-1 rated against electrical shock and foreign objects when all dead fronts are in place.

How does a battery cabinet work?

For multiple battery cabinets incorporating battery disconnects, the cabinets are bolted together, forming a single lineup with the UPS. The cabinet grounds are inherently connected to the UPS ground bus via the metal chassis.

Why are UPS batteries connected in series?

The batteries are connected in series to reach the voltage levels required by the UPS . The battery series are connected in parallel in turn and so that they can reach the necessary capacity for the autonomy required .

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UPS battery cabinet ground discharge principle

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Apr 23, 2025 · 2. Grounding of UPS body part The APC UPS body, its casing, battery cabinet (rack), etc. need to be connected to the electrical grounding device using grounding wires.

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