EZAutomation EZ Touch EZ7 Series, Quick Start Manual, Page: 10 / 32

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Similarly, the equipment enclosures are generally either
painted or anodized. Mounting of painted or anodized
enclosures to like surfaces also does not ensure good
metallic contact between the equipment chassis and
cabinet. It is imperative that the equipment chassis are
grounded such as through the use of grounding straps as
illustrated below.
Cabinet Wiring
The wiring of the EZ7 Series HMI to the “field” outside the cabinet must be by design. The wiring
cannot be random in order to get the various points of the cabinet and the “field” electrically
connected. Below are some general rules that apply in most situations:
Provide a separate power source to electronic controls and keep this power bus away from any I/O
power.
The cabinet should be wired with a safety ground (the main safety ground wire gauge is determined
by the cabinet’s total current consumption) and in accordance with all electrical code requirements.
Once the cabinet doors, stationary sub-panels and swing-out sub-panels have been “strapped” to the
main cabinet, it is not necessary to run safety ground wires from the equipment chassis terminals to
the main safety ground connection.
The safety ground terminal of each component can, and should be, connected with the shortest wire
possible, to the cabinet or sub-panel frame.
Plan the wiring routing. Keep all switched power in separate ducts and if there is AC and DC power
being switched, keep the wiring of each branch separate from all wires and cables carrying low level
signals.
Keep all three phase power outside of the cabinet, but if it becomes necessary, keep the runs as short
as possible and maintain the maximum possible distance between the three phase bus and all other
wiring.
Primary power leads to the control equipment (Base power terminals) should be made with a two
wire twisted cable with approximately 12 turns per foot. The length of these cables should be kept to
a minimum, and to the greatest extent possible, such cable runs should be kept separate from other
wiring.