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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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    Depending upon the exact circumstances, it probably be argued that the fuse or circuit breaker protecting the fixed instalation does also protect any appliance connected thereto, therefore overload protection only may suffice.

    An isolater may not be needed. An emergency stop button is probably required, but isolation for maintenance or repair could reasonably be achieved by unplugging the machine, or by locking of an isolater in the fixed installation.
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    Depending upon the exact circumstances, it probably be argued that the fuse or circuit breaker protecting the fixed instalation does also protect any appliance connected thereto, therefore overload protection only may suffice.

    An isolater may not be needed. An emergency stop button is probably required, but isolation for maintenance or repair could reasonably be achieved by unplugging the machine, or by locking of an isolater in the fixed installation.
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