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3
Grounding Requirements
An effectively grounded product is one that is
connection or connections of sufficiently low impedance and having sufficient current-carrying capacity to
prevent the build up of voltages which may result in undue hazard to connected equipment or to
Grounding of the Protege System is done for three basic reasons:
1.
Safety,
2.
Component protection, and
3.
Noise reduction
3.1 Safety Grounding
The object of safety grounding is to ensure that all metalwork is at the same ground (or Earth) potential.
Impedance between the Protege System and the building scheme ground must conform to the requirements of
national and local industrial safety regulations or electrical codes. These will vary based on country, type of
distribution system, and other factors. The integrity of all ground connections should be checked periodically.
General safety dictates that all metal parts are connected to earth with separate copper wire or wires of the
appropriate gauge.
3.2 Earth Ground Connection
The Protege DIN Rail Enclosure and the Protege DIN Rail Modules must be grounded to a single point earth
ground. For best results, a cold water pipe should be used with a pipe wiring clamp. If a cold water pipe is not
available, connect to a suitable ground connection in the installation. A minimum 14AWG solid copper wire (or
thicker in accordance to local authorities) shall be used from the Protege DIN Rail System's earth connection
points to the clamp on the cold water pipe. If other earth clamps are present at the same connection point,
connect the clamp below the existing units.
The Protege DIN Rail Enclosure includes an earth ground single point link connection via the metallic enclosure.
This single point link is the Protege DIN Rail System's earth ground. All Protege DIN Rail Modules that have
earth ground connections and that are installed in the same Protege DIN Rail Enclosure shall be connected to
this single point. A single point earth ground connection avoids the creation of ground loops in the system and
provides a single reference point to earth ground.
Protege DIN Rail 8 PGM Output Expander
intentionally connected to earth ground through a ground
| Installation Manual
persons.
7
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