YSI DIQ/S 182 XT-4 System 182 XT-4 - Manual (Page 23)

System 182 XT-4 Installation
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are provided on both sides, the shield must also be connected on
both sides. The inner conductors must have no contact with the
potential equalization.
– Relay lines should be connected to the local potential
equalization in order to provide general and consistent protection
via gas overvoltage surge arresters.