MAN0964-13-EN_XL4_UM
A u g u s t 6 , 2 0 2 1 P a g e 22 | 194
CHAPTER 4: ELECTRICAL INSTALLATION
NOTE: The datasheet is the first document to refer to for model-specific information related
to XL4 OCS models such as pin-outs, jumper settings, and other key installation information.
Visit our website to obtain datasheets, user documentation, and updates.
North America https://hornerautomation.com
Europe http://www.hornerautomation.eu
4.1 Grounding Definition
Ground: The term Ground is defined as a conductive connection between a circuit or piece of
equipment and the earth. Grounds are fundamentally used to protect an application from
harmful interference causing either physical damage such as by lightning or voltage
transients or from circuit disruption often caused by radio frequency interference (RFI).
4.2 Ground Specifications
Ideally, a ground resistance measurement from equipment to earth ground is 0Ω. In reality, it
typically is higher. The U.S. National Electrical Code (NEC) states the resistance to ground
shall not exceed 25Ω. Horner APG recommends less than 15Ω resistance from our equipment
to ground. Resistance greater than 25Ω can cause undesirable or harmful interference to the
device.
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