Equipment Installation
Safety Manual 3
–3
Protective Chassis and Ground Connections
Before connecting any electrical signal or power, the protective and chassis
grounds must be connected. Requirements for the protective and chassis
grounds include the following:
• Protective and chassis grounds must be of equal or greater size than
any other current-carrying conductors, including the heater located
in the sample conditioning system
• Protective and chassis grounds to remain connected until all other
wiring is removed
• Insulated protective and chassis ground wiring must use the
green/yellow color
• Protective grounding wire current carrying capacity must be at
minimum the same as the main supply
• Earth bonding/chassis ground shall be at least 12 AWG (4 mm2)
Color coding
Green-and-yellow insulation shall only be used for:
• Protective earth conductors
• protective bonding conductors
• potential equalization conductors for safety purposes
• functional earth
Connections to the Supply
Use the following procedure to connect the sample supply line.
Consult the layout and flow diagrams in the system drawings. All work must be
performed by technicians qualified in pneumatic tubing.
A switch or circuit breaker must not interrupt a protective earth
conductor.
Thread lubricant must be applied on all conduit hub threaded
connections.
SpectraSensors recommends using STL8 lubricant
on all conduit screw thread and it’s taped openings.
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