Next Upstream Protective Device Trace and Isolation Protective Device Trace

The following table describes the labels applied to protective device features traced by both of these trace tasks. Downstream symbols will never appear in the Next Upstream Protective Device Trace.



Upstream, closed device

Previously found, upstream, closed device

Downstream, closed device

Previously found, downstream, closed device

Downstream, open device

Previously found, downstream, open device

Indeterminate symbols: Based on the starting point of the trace, it is unknown whether the device is upstream, downstream, energized or de-energized.

Indeterminate, closed device


Previously found, indeterminate, closed device


Indeterminate, open device


Previously found, indeterminate, open device


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