Backfeed Protection
 DANGER |
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Hazard of electric shock, explosion, or arc flash
Mandatory backfeed protection on bypass must be implemented
by installation of upstream disconnect device with shunt trip connected
to the UPS. See diagrams and instructions in Installation of Third Party Backfeed Protection.
Failure to follow these instructions will result in death or serious injury.
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Installation of Third Party Backfeed Protection
Connect the disconnect device shunt trip and AUX switch to the UPS as shown below. Use double insulated cables. Disconnect device shunt trip must be rated for 24 VDC nominal, inrush max 200 W. The cable supplying the shunt trip shall be a double insulated cable and rated for 600 VAC. The cables shall be sized taking the cable voltage drop and the recommendation of the shunt trip manufacturer into consideration.
Label 885-92858 (provided with the UPS) must be placed visible at the bypass upstream disconnect device.
| DANGER |
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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 (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.
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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, 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 |
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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.
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UPS and Third Party Backfeed Protection – Single Mains
UPS and Third Party Backfeed Protection – Dual Mains
