COMMON AR 2498091 - Caterpillar

Shielding
Shielding must be terminated only at the control end of the cable. Special exceptions may exist. These exceptions must be clearly documented as an exception.Sensors
A sensor needs to have a signal path and a return path to the control that is supplied by the sensor.Three-Wire Sensor
A three-wire sensor system uses a reference voltage in addition to the signal and the return.Single-Wire Sensors
Single-wire sensors are discouraged because these sensors use the engine block or the generator as a current return path which can lead to engine failures.Magnetic Pickups
The magnetic pickup must use shielded twisted-pair cable. The shield must be grounded at the battery negative connection point.The connection between the mag pickup and the control should preferably be the following type of connection:
A connection without breaks
A connection with minimal length
A connection that is not routed along side of other conductors.If the connection must include a connector, the contact should be made with the use of high-quality contacts that are gold plated. The cable for the mag pickup should not be routed with other conductors that carry AC line voltage.Thermocouple Wiring
Thermocouple wiring must use the appropriate wire type in a continuous run. Thermocouple wiring must be isolated from ground.Actuators
Caterpillar recommends a dedicated return conductor when you are wiring the actuators. Using the engine block or the generator frame as a current return path must be avoided whenever it is possible to avoid potential engine failures.Conductors
Caterpillar recommends separating the signal wiring from the AC cables to avoid noise coupling.Maintenance
The grounding systems must be part of the maintenance plan of the generator set. A visual inspection that looks for corrosion must be combined with testing of the ground connections.Grounding maintenance instructions must be included in the maintenance instructions.References
Standards
IEC/EN 60439
IEC/EN 60204-1
IEC 60446 (color codes)
IEC 60417 (symbols)
UL2200 (stationary generator sets - US)
CSA-C22.2 No. 0.4-04 (grounding - Canada)
NFPA 70 (NEC – US)
IEEE Std 142 (the Green Book)
IEEE Std C37.101
IEEE Std C37.102
IEEE Document 95TP102 (1995)Other Publications
A and I Guide BBBB-YYYY Pub in conjunction with Design GuideDefinitions
Bond - A reliable electrical connection between two conductive partsBonding (Bonded) - The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed (NFPA 70)Bonding Conductor - A protective conductor providing electrical equipotential bonding (IEE Wiring Regulations -17th Edition)Bonding Jumper - A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected (NFPA 70)Customer Ground Connection Location - The Customer Ground Connection Location is the single location the customer must connect to for proper earth grounding of the package or enclosure. This connection point is in a protected location that is marked by the standard ISO symbol.Earth - In this document, earth is the conductive mass of the earth. The electric potential at any point of earth is conventionally taken as zero. Earth is also called ground.Earth Electrode (Rod) - The Earth Electrode (Rod) is the conductive part (for example a copper rod), which may be embedded in the