Anbotek holds CNAS accreditation for UL 1778 testing and possesses extensive experience in testing against standards for Portable Energy Storage Systems (PESS), inverters, and UPS products. Contact us for inquiries – choose Anbotek as your trusted partner!

UPS Users: Beware! One Oversight Could Lead to Electric Shock Hazard!

• When your UPS is discharging stored energy, have you considered – could lethal voltage remain at its input terminals?
• Anbotek Lab Data Reveals: Shock incidents due to failed feed protection surged 67% in 2024! How to ensure safety? The “Feed Protection Test (FFF.1)” in UL 1778 is the critical solution!
• Mitigate feed-through risks, eliminate hazards, and ensure end-user safety through comprehensive product testing!

UL 1778 Standard Requirement (Feed Protection):

During UPS operation in stored energy mode, excessive contact current between any input terminal pair is prohibited. Contact current measurement is exempt if the measured open-circuit voltage is ≤ 30V RMS (42.4V peak, 60V DC).

When the UPS is in stored energy mode and its input terminals/plug are disconnected (under no-load or full-load conditions), the following must be satisfied:
a) Under normal and any single fault condition, current measured between any two user-accessible input terminals using the circuit in Appendix U2 shall not exceed 3.5mA.
b) If protection is provided by an internal system, it must activate within 1 second of input disconnection.

Note: Compliance must be verified under normal, abnormal operating conditions, and with added capacitance as shown in the following circuit diagram (referencing the feed value).

Leverage Anbotek’s UL 1778 CNAS accreditation and deep expertise in PESS, inverter, and UPS standards testing. Contact us today and partner with Anbotek!