Rosemount 700XA - Gas Chromatograph Wiring

2.3 Gas chromatograph wiring
2.3.1 Wiring precautions
• All wiring, as well as circuit breaker or power disconnect switch locations, must
conform to the CEC or NEC; all local, state, or other jurisdictions; and company
standards and practices.
• Provide single-phase, three-wire power at 115 or 220 Vac, 50-60 Hz.
NOTICE
If you do not have a single phase, three-wire AC power source, you must purchase an
isolation transformer.
• Locate a power shut-off or disconnect switch in a safe area.
• Provide the gas chromatograph (GC) and any optionally installed devices with one 20-
amp circuit breaker for protection.
CAUTION
POWER
15 amps is the maximum current for 14 American Wire Gauge (AWG).
• Use multi-stranded copper conductor wire according to the following
recommendations:
— For power feed distances up to 250 ft. (76 m), use 14 AWG (18 Metric Wire Gauge),
stranded.
— For power feed distances 250 to 500 ft. (76 to 152 m), use 12 AWG (25 Metric Wire
Gauge), stranded.
— For power feed distances 500 to 1000 ft. (152 to 305 m), use 10 AWG (30 Metric
Wire Gauge), stranded.
2.3.2
Signal wiring
Follow these general precautions for field wiring digital and analog input/output (I/O)
lines:
• Metal conduit or cable (according to local code) used for process signal wiring must be
grounded at conduit support points, because intermittent grounding helps prevent the
induction of magnetic loops between the conduit and cable shielding.
• All process signal wiring should be of a single, continuous length between field devices
and the gas chromatograph (GC). If, however, the length of the conduit runs require
that multiple wiring pulls be made, the individual conductors must be interconnected
with suitable terminal blocks.
• Use suitable lubrication for wire pulls in conduit to prevent wire stress.
• Use separate conduits for AC voltage and DC voltage circuits.
Installation and start-up Quick Start Guide
July 2020 00825-0100-3770
18 Emerson.com/Rosemount