BILS-10003 rev E
13
302
Hard-wired Installations
General requirements for hardwire Herytage UPS installations
– Input over-current protection and Output over-current protection and AC output
disconnect switch for Herytage UPS must be provided by the installer. It should be
installed and sized according to national and local electrical codes.
– External bypass switches should be installed within sight of Herytage UPS.
– Follow applicable national and local electrical codes when installing the grounding
system. Herytage UPS grounding conductor should be at minimum the same size
(ampacity) as circuit conductors.
– All circuit conductors including the neutral should be the same size (ampacity).
– Use isolated ground receptacles to obtain the best protection against electrical
noise.
– A separate dedicated conduit system should be utilized for the Herytage UPS input
and output wiring.
– Flexible conduit should be used to allow movement of the Herytage UPS to gain
side service clearance.
– Load imbalance should not exceed 40% / 60%; 2-4K units do not have this
restriction. 6K units L1-N 100% max., L2-N 50% max.
302-1 External bypass switch installations
The 2kVA through 20kVA Herytage UPS may be ordered with an external bypass
switch. The external bypass switch is typically mounted on a wall within site of the
Herytage UPS. See Figure 302-1A.
1.
The wiring access panel for the external bypass switch is located on the front
bottom half of the external bypass switch module, remove the screws securing
the bottom half of the front cover to obtain access to the terminal blocks. See
Figure 302-1B
2.
Input and output wiring to and from the Herytage UPS and to and from the
external bypass switch should be routed through separate conduits. Conduit
connection points are located on the back of the UPS, the same conduit
connection points are on the external bypass switch. Locate the pre-punched
knockouts for starter holes.
3.
Review input and output voltages on the unit data plate and insure they are
proper for your installation, select wiring connection diagram figure 1 or 2 for
appropriate connection. If the wrong input or output voltages were ordered –
call Legacy Power Conversion customer service for assistance.
