APC MW II User Manual
Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001
10
External Bypass Static Switch Wiring
Warning: Before you start the installation, verify that all AC and DC power source
breakers are in the open position.
breakers are in the open position.
Warning: Use only manual reset protection as input over-current protection.
Warning: Over-current protection required by national wiring rules.
Warning: The UPS has no built-in disconnect devices to switch off external AC (Q1 and
Q5) and DC (Q7 and Q8) input power. Ensure that the disconnect devices are available
as separate components for this installation.
Q5) and DC (Q7 and Q8) input power. Ensure that the disconnect devices are available
as separate components for this installation.
Caution: The External Bypass Static is not provided with built-in backfeed protection. Use
suitable breakers with a minimum of 0.8 in/20 mm air gap and trip function. The breaker is
controlled from the External Bypass SSW and will be tripped in case of backfeed.
suitable breakers with a minimum of 0.8 in/20 mm air gap and trip function. The breaker is
controlled from the External Bypass SSW and will be tripped in case of backfeed.
Note: The installer must provide each external disconnect device for this UPS system with
labels displaying the following text: “Isolate the Uninterruptible Power Supply (UPS) as
instructed in the User Guide before working on the circuit.”
labels displaying the following text: “Isolate the Uninterruptible Power Supply (UPS) as
instructed in the User Guide before working on the circuit.”
Note: The installation of the External Bypass Static Switch must comply with local and
national regulations.
national regulations.
Note: Run matched set of phase cables in the same cable run(s). Do not separate phases into
different cable runs.
different cable runs.
Note: Use only copper conductors.