Grounding Installation Requirements; Grounding Guidelines - Emerson FloBoss 103 Instruction Manual

FloBoss 103/104 Instruction Manual
Caution
Warning

3.2 Grounding Installation Requirements

3.2.1
3-2
Do not allow the batteries to fully discharge. Either keep providing input
power or turn the device off. If the batteries fully discharge, the battery
charger board may enter thermal limiting, which prevents the batteries
from overheating but restricts input power.
Connecting the FB103 or FB104 to a continuous power source without
removing the battery charger module may result in battery overcharging
and failure. See Section 3.5.1, Overcharging Potential.
The National Electrical Code (NEC) governs grounding wiring
requirements for DC voltage sources equipment. 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.

Grounding Guidelines

Properly grounding the FB100 helps to reduce the effects of electrical
noise on the unit's operation and protects against lightning. The FB100
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. You may also consider a telephone surge protector
for the optional dial-up modem communications card.
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
conductor should have a resistance of 1 ohm or less between the FB100
enclosure ground and the earth ground rod or grid.
The recommended cable for I/O signal wiring is an insulated, shielded,
twisted-pair. The twisted pair and the shielding minimize signal errors
caused by EMI (electromagnetic interference), RFI (radio frequency
interference), and transients.
Power Connections Revised August-2017