Wire Preparation - Hach EC1000 Instruction Manual

Figure 18 Controller Circuit Board

5.6.1 Wire Preparation

Because low voltages (voltages <30Vrms) and primary voltage (115/230 Vac) are not
separable within the controller enclosure, it is necessary that all customer wiring be 300V
or more to assure adequate levels of insulation protection of low voltage wires from high
voltage circuits. Additionally, the recommended cable for signal wires (electrode,
recorder, controller, and SIO) is 22 AWG twisted pair shielded cable, which assures
compliance with RF immunity and emissions standards.
The alarm cable can be unshielded cable sized according to the load being used. Prepare
the cables as follows: Strip the outer jacket back 7 inches. Cut the shield wire to a length of
3 inches.
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