Exposed Ground Wire Can Cause A Loop To Earth Ground

A low-voltage switch junction box does not require a ground wire to be installed. An exposed ground wire on a junction box may potentially touch the circuit board of the low-voltage switch (chelsea, knightsbridge, rocker, and switch bolt) which causes the GR2400 bus to be shorted to earth ground. 

A short to earth ground causes the GR2400 bus to be unstable.

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