990-91380C-001

Backfeed Protection

DANGER
Hazard of electric shock, explosion, or arc flash
Mandatory backfeed protection on bypass must be implemented by one of the following methods:
  • Installation of upstream breaker with shunt trip connected to the UPS. See diagrams and instructions in Installation of Third Party Backfeed Protection.
  • Installation of internal backfeed kit (GVLOPT003 or GVLOPT004) in the UPS. The internal backfeed kit must be installed before the power cables are connected in the UPS. Follow the installation manual provided with the internal backfeed kit.
  • Installation of maintenance bypass cabinet (GVLMBCA200K500H or GVLMBCA200K500G) where the breaker is included. Follow the installation manual provided with the maintenance bypass cabinet. Label 885-91965 (provided with the UPS) must be placed visible on the maintenance bypass cabinet.
Failure to follow these instructions will result in death or serious injury.

Installation of Third Party Backfeed Protection

Connect the breaker shunt trip and AUX switch to the UPS as shown below. Use double insulated cables. Breaker shunt trip must be rated for 24 VDC nominal, inrush max 100 W.

Label 885-91965 (provided with the UPS) must be placed visible at the bypass upstream breaker.

DANGER
Hazard of electric shock, explosion, or arc flash
In systems where backfeed protection is not a part of the standard design, an automatic isolation device (Schneider Electric backfeed protection option or other device, such as a breaker, switch, or contactor with trip function, meeting the requirements of IEC62040-1 or UL1778 5th edition – depending on which standard apply to your local area), is required to be installed to prevent hazardous voltage or energy at the input terminals of the isolation device. The device must be rated and controlled according to the specifications in this manual.
Failure to follow these instructions will result in death or serious injury.

When the UPS input is connected through external isolators that, when opened, isolate the neutral or when the automatic backfeed isolation is provided external to the equipment or is connected to an IT power distribution system, a label must be fitted at the UPS input terminals, and on all primary power isolators installed remotely from the UPS area and on external access points between such isolators and the UPS, by the user, displaying the following text (or equivalent in a language which is acceptable in the country in which the UPS system is installed):

DANGER
Hazard of electric shock, explosion, or arc flash
Risk of voltage backfeed. Before working on this circuit: Isolate the UPS and check for hazardous voltage between all terminals including the protective earth.
Failure to follow these instructions will result in death or serious injury.

UPS and Third Party Backfeed Protection – Single Mains

UPS and Third Party Backfeed Protection – Dual Mains

QR code for this page

Was this helpful?