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Portable HPU Panel overload protection query

Former Community Member
Former Community Member
Hi all, newbie so be gentle :)


Our company has portable 415V hydraulic power units from 7.5 to 18.5kW.


On all control panels there is no short circuit device (MCCB or MCB) only a thermal overload and on nearly half, no isolator. Is this standard for this type of unit? These unit are plugged in to site 415 distribution panels which, I assume, will have generic (at a guess) 32A and 63A outlets. It goes against everything I ever did as a panel wireman.


Any words of wisdom, as I'm being asked to make a new panel for o ne of the units and not sure I'm happy with this setup.


Cheers,


G
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  • 0
    Hi and Welcome.


    The motor presumably has the normal overload against overcurrent operation so will be fine. The site sockets will be red 3 phase I presume with BS4343 connectors, and these or the generator will have RCD protection against Earth faults. The units presumably have soft or star-delta starters. It all sounds pretty normal for larger equipment and is probably covered by BS7909 more than BS7671 for all the distribution and power equipment. It might be worth fitting a phase failure relay to the starter because this is the most likely thing to cause motor damage.


    For those not familiar, I would expect a motor, hydraulic pump, fluid reservoir, pressure regulation valve, and hydraulic circuit connectors so not much electrical except the starter, on-off buttons, and motor starter. The stop button could be a large lock-off type as an emergency stop, but nothing too dire will happen even with a burst hose, just a mess. There is probably nothing moving that can be touched.


    The only point is that the Earth connections and cables should be regularly tested for adequate continuity, depending on site usage and conditions.
Reply
  • 0
    Hi and Welcome.


    The motor presumably has the normal overload against overcurrent operation so will be fine. The site sockets will be red 3 phase I presume with BS4343 connectors, and these or the generator will have RCD protection against Earth faults. The units presumably have soft or star-delta starters. It all sounds pretty normal for larger equipment and is probably covered by BS7909 more than BS7671 for all the distribution and power equipment. It might be worth fitting a phase failure relay to the starter because this is the most likely thing to cause motor damage.


    For those not familiar, I would expect a motor, hydraulic pump, fluid reservoir, pressure regulation valve, and hydraulic circuit connectors so not much electrical except the starter, on-off buttons, and motor starter. The stop button could be a large lock-off type as an emergency stop, but nothing too dire will happen even with a burst hose, just a mess. There is probably nothing moving that can be touched.


    The only point is that the Earth connections and cables should be regularly tested for adequate continuity, depending on site usage and conditions.
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