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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

    The Power Meter has to be installed upfront of the installation to measure the power being drawn by the entire installation, of course the the manufacturers video makes this look easy however in most UK installations it’s not going to be easy as it would need another small consumer unit with the Power Meter in it in the tails upfront of the installation.

    That is no where near as easy as using CT clamps, so they would seem to be preferable.

    www.gavazzionline.com/.../EM112DS.pdf

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  • 0

    The Power Meter has to be installed upfront of the installation to measure the power being drawn by the entire installation, of course the the manufacturers video makes this look easy however in most UK installations it’s not going to be easy as it would need another small consumer unit with the Power Meter in it in the tails upfront of the installation.

    That is no where near as easy as using CT clamps, so they would seem to be preferable.

    www.gavazzionline.com/.../EM112DS.pdf

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  • 0 in reply to Sparkingchip
    Sparkingchip said:
    of course the the manufacturers video makes this look easy however in most UK installations it’s not going to be easy as it would need another small consumer unit with the Power Meter in it in the tails upfront of the installation.

    Can the DNO fuse be used to protect this meter? I don't think the DNO would be happy at that?

    It's rated CAT III, not CAT IV, so ideally installed downstream of SPDs, certainly where Type 1's are needed?

    Certainly from a quick glance at the data sheet, a number of things to scratch the head for an installer? If I were presented with this data sheet, I'd seriously consider whether it would be better to power voltage from a circuit on the CU, downstream of SPDs, and use a current transformer input on the tails, making sure, of course, that any insulated (unsheathed) wiring on the current transformer, and the current transformer itself, were in an enclosure / containment.

  • +1 in reply to Sparkingchip

    I had the unfortunate experience of fitting one of these recently. I thought about it loads before I did the install as well as questioning myself if I’d done it right afterwards! What a ridiculous design and way of doing it, I will go out of my way not to do one again! It turned what should have been a half day into a full day on the hottest day of the year. CT clamps on the tails are definitely a simpler solution!

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