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Modbus and CAN bus data cable selection.

Sparkingchip

An EVSE manufacturer recommends using shielded Cat 5E cable for a Modbus connection from the charger to the Power Meter, whilst recommending unshielded Cat 5E for interconnecting the chargers using CAN bus for load management.

Seeing as they say they are recommendations, is there any particular reason why Modbus needs shielded data cable and CAN bus needs unshielded?

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  • 0

    Not really ... in fact, they are both modbus, but one has a hardware specification too.

    It's very odd to use two (slightly) different implementations in the same device.

    Anyway ... CANbus generally does not usually require shielded cable, even in industrial environments.

    It may be that the recommendation comes from it being "outdoor" ... or alternatively something that came out of the manufacturer's EMC testing (in which case, to fail to install to manufacturer's instructions could well mean taking responsibility for the EMC compliance of the installation).

    Whichever, if you provide separate TT for the charging point, earthing (one end vs both ends), and Surge Protection (of both power AND data) could be a consideration.

    In fact, dependent on distances from the IGZ of a main building, it may be necessary to provide surge protection for both power and data in any case.

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  • 0

    Not really ... in fact, they are both modbus, but one has a hardware specification too.

    It's very odd to use two (slightly) different implementations in the same device.

    Anyway ... CANbus generally does not usually require shielded cable, even in industrial environments.

    It may be that the recommendation comes from it being "outdoor" ... or alternatively something that came out of the manufacturer's EMC testing (in which case, to fail to install to manufacturer's instructions could well mean taking responsibility for the EMC compliance of the installation).

    Whichever, if you provide separate TT for the charging point, earthing (one end vs both ends), and Surge Protection (of both power AND data) could be a consideration.

    In fact, dependent on distances from the IGZ of a main building, it may be necessary to provide surge protection for both power and data in any case.

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