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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 elevated 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
3.
Noise reduction
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.
Earth Ground Connection
The DIN rail enclosure and the DIN rail modules must be grounded to a suitable single-point earth ground
connection in the installation. A minimum 14AWG solid copper wire (or thicker, in accordance with local
authorities) shall be used from the Protege system's earth connection points.
The DIN rail enclosure includes an earth ground single-point link connection via the metallic enclosure. This
single-point link is the Protege system's earth ground. All modules that have earth ground connections and that
are installed in the same 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.
DIN Rail Ground Connections (one or more cabinets installed in the same room)
AC Mains Wiring
PRT-ADC4-DIN | Protege DIN Rail 4 Channel Analog Input Expander | Installation Manual
intentionally connected to earth ground through a ground
Module Network
(RS-485 N+, N-, NA, NB)
DIN Rail Enclosure
Controller
Dialer's Earth
Ground Connection
Power Supply
V-
Earth Ground
Link Connection
Additional DIN Rail Enclosure(s)
Reader Expander
Input Expander
Output Expander
persons.
6
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