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What are the direct connection voltage limits for DM6000H meter ?

You can connect the meter’s voltage inputs directly to the phase voltage lines of
the power system if the power system’s line-to-line or line-to-neutral voltages do
not exceed the meter’s direct connect maximum voltage limits.

The meter's voltage measurement inputs are rated by the manufacturer for up to
277 V L-N / 480 V L-L. However, the maximum voltage allowed for direct
connection may be lower, depending on the local electrical codes and regulations.
As per installation category III the maximum voltage on the meter voltage
measurement inputs should not exceed 277 V L-N / 480 V L-L.