General Information and Checkout Procedure Measurement Expected Value
Method 1:
AC voltage between shield conductors and device chassis ground-
the voltage difference between BACnet MS/TP device chassis ground
connections should be close to zero. If the voltage difference is greater that
4.0 Vac, there will be marginal communication or intermittent
communication problems. If the voltage difference is greater that 7.0 Vac,
some devices will no longer communicate.
Measure AC current
across the current
termination and confirm
that only one end of the
shield conductor is tied to
the earth ground
Vac ≤ 2.0 V
Method 2:
AC voltage between earth ground and device chassis ground- the
chassis ground of the UC400 needs to be connected to earth ground by
some route.
Note: Do not assume that the building frame is a valid earth ground.
Measure AC current
across the current
termination and confirm
that only one end of the
shield conductor is tied to
the earth ground
Vac ≤ 4.0 V
(Must comply with National Electrical
Code™and local electrical codes)
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