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FloBoss 107 Instruction Manual

Revised June-2017 Installation and Use 2-5

Figure 2-3. Power Connection on Base Unit

Table 2-1. Power Connections

Label

Function

Connection to Power Source

–

Ground

The FB107 accepts input voltages from 8.0 volts to 30 volts at the PWR

(IN+ / IN) terminals on the CPU. The CPU terminal block accepts wires

from size 16 to 24 AWG.

The AUX PWR IN terminal block accepts wires from size 12 to 22

AWG.

2.1.5 Grounding Installation Requirements

Grounding wiring requirements for dc voltage sources equipment are

governed by the National Electrical Code (NEC). When the equipment

uses dc voltage sources, the grounding system must terminate at the service

disconnect. All equipment grounding conductors must provide an

uninterrupted electrical path to the service disconnect.

 The National Electrical Code Article 250-83 (1993), paragraph c,

defines the material and installation requirements for grounding

electrodes.

 The National Electrical Code Article 250-91 (1993), paragraph a,

defines the material requirements for grounding electrode conductors.

 The National Electrical Code Article 250-92 (1993), paragraph a,

provides installation requirements for grounding electrode conductors.

 The National Electrical Code Article 250-95 (1993) defines the size

requirements for equipment grounding conductors.

Proper grounding of the FB107 helps to reduce the effects of electrical

noise on the unit’s operation and protects against lightning. The FB107

provides lightning protection for built-in field wiring inputs and outputs.

Install a surge protection device at the service disconnect on dc voltage

source systems to protect against lightning and power surges for the

installed equipment.

All earth grounds must have an earth-to-ground rod or grid impedance of 25

ohms or less as measured with a ground system tester. The grounding

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