Network Meter Block Installation, Operation, & Maintenance Manual
Pre-Installation Considerations 5
2 Pre-Installation
Considerations
2.1 Electrical Installation Considerations
In addition to the following installation recommendations, all previous warnings and cautions should be
reviewed before installation.
• All wiring into the NMB must be routed through the cable entries.
• The direct current (DC) signal wires must be shielded multi-conductor cable of 18 to 24 American wire
gauge (AWG) minimum stranded copper.
• It is recommended that ferrules be installed on all stranded copper signal wiring.
2.1.1 Power Supply
The NMB requires an external power supply (not included) with a voltage range between 12 to 24 volts
direct current (VDC). The power supply must be assigned a switch or power-circuit breaker (suitable for
the area’s hazardous classification) so the primary side of the power supply can be easily disconnected
from the alternating current (AC) mains electric power. The switch or power-circuit breaker should be
clearly marked as to its function.
We recommend that the power supply meet one of the following standards, depending on your local
jurisdictions:
• EN/IEC/UL/CSA 62368-1
• Safety Extra Low Voltage (SELV)
• Protective Extra Low Voltage (PELV)
• United Laboratories (UL) 508
• National Electrical Code (NEC) Class 2
For additional details about the power supply, see Section 3.3.1: Power Supply.
The following recommendations are based on our knowledge of electrical codes. Your local electrical
codes should be reviewed to ensure that these recommendations follow the local code. Additionally,
you should review the installation manuals for all the equipment being wired into the NMB for
transmission distances and wire recommendations.
The NMB and ancillary electrical support equipment should only be installed by properly trained
personnel. The installer must comply with all national and international regulations for their location
regarding the installation of electrical systems.
Substitutions within the NMB or other certified ancillary equipment is not allowed and will void Ex safety
certifications.
Always follow the manufacturer’s recommendations and warnings when installing the power supply.
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