5Insert the conduit through the wiring access entry and attach the conduit fitting to the panel. Strip 0.5” (1.5 cm) of insulation from the end of each incoming wire.
CAUTION: If the UPS does not have an automatic protection device against current backfeed, Dell recommends installing an external isolating device (see Figure 19). After the device is installed, you must add a warning label with the following wording or the equivalent on the external AC contactor:
RISK OF VOLTAGE BACKFEED. Isolate the UPS before operating on this circuit, then check for hazardous voltage between all terminals.
External Distribution Panel
QT
L/L1
N/L2
B
UPS
L/L1
N/L2
Legend
BCoil Remote Switch
Q
TAC Contactor ( see Table 1)
N/L2 Neutral/L2
L/L1 | L1 Line Input |
Figure 19. Typical External Isolating Device Installation
The following table lists AC contactors that can be used as backfeed protection devices.
Table 1. Backfeed Protection Devices
Manufacturer | Type | Rating | |
|
|
| |
Tianshui 213 Electrical Apparatus Co., Ltd. | |||
(E203071) | |||
|
| ||
|
|
| |
Moeller GMBH | 600 V, 40A | ||
|
|
| |
LS Industrial Systems Co., Ltd. (E108780) | 600 Vac, 45A | ||
|
|
|