Site Considerations for Equipment Installation, Grounding, and Wiring Manual
D301452X012
October 2019
Installation 5
Table 2-2: Considerations for Protecting Equipment
Environment: Class I, Division 2 –
Nonincendive
Environment: Class I, Division 1 - Intrinsically
Safe
Other: Safe or unrated area
See appendices in hardware instruction
manual.
Earth Ground - Established by
mechanical/electrical or both or not at all
Is the area prone to lightning strikes?
Are there surge suppressors installed or to
be installed?
Are there overhead or underground power
or communication cables in the immediate
area?
Is there an antenna in the immediate area?
How close is other equipment? Can
someone safely touch this equipment and
the RTU/flow computer simultaneously?
Determine equipment ground
requirements. How will the RTU/flow
computer and its related wiring be
grounded? Consider earth ground, circuit
ground, conduit ground, and site grounds.
Are there any obviously faulty or
questionable power or ground circuits?
2.3 Other Site Safety Considerations
Identify overhead or underground power or communication cables prior to installing a new unit.
Accidentally cutting, shorting or simply just contacting power, ground, communication or process
control I/O wiring can have potentially devastating effects on site equipment, the process system,
and or personnel.
Do not assume that it is safe to touch adjacent equipment, machinery, pipes, cabinets or even the
earth itself. Adjacent equipment may not have been properly wired or grounded, may be defective,
or may have one or more loose system grounds. Measure for voltage between the case of a
questionable piece of equipment and its earth ground. If a voltage is present, something is wrong.
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