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NOTE: The NEC dictates that Commercial AC will have the Neutral strapped to ground. No
Figure 3-2: Model 827 Inverter System With Maintenance Bypass Switch And Optional Inverter Shelves
3.2 Utility (Commercial AC) Input Connections
WARNING: All power should remain in the OFF position for the entire installation section. Serious
injury or death could occur from live AC circuits. ABB POWER recommends that Licensed
Electricians wire all AC connections into the MBS.
A. Remove the rear cover to access the AC input connections. Refer to Figure 3-3.
B. Connect the commercial 120VAC power to the input connections as shown in Figure 3-3. Each input connection
is made via a compression screw. Maximum size cable is 350 MCM.
C. Ensure that commercial AC power is protected from the customer side of the bypass panel.
D. If used with an 827E Inverter Plant, a circuit breaker is provided in the inverter shelf to provide over current
protection or disconnect means between the inverter and MBS.
E. Over current protection for Commercial AC fed to the MBS is to be provided by the customer per the National
Electrical Code
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separately derived system (see NEC Article 100 for definition).
827E MBS_MAN
Rev. 2.4
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