Magnetic Yoke Battery pack

400 watt modified sine, 240 volt Inverter
It should be noted that the MPI Yoke Inverter [Mk-7X- RCD] is RCD protected. The unit has
been designed to be portable and built for use on construction sites where an RCD protected
supply is not available, or a generator is not a practical option, or situations of restricted
access, or rope access work and offshore construction or where extended lengths of
extension cables are not permitted.
To conform to standard MPI testing techniques the unit is intended for short time and
intermittent operation, not continuous; as per AS NZS 4763-2011 6.2
It is common practice to charge crawler and radiation alarm SLA, VRLA batteries in their
field enclosures without venting. To comply with AS 4086.2 battery charging should be
carried out with the inverter lid partially opened and the main switch OFF.
As per all site work a SWMS and JSA should cover the safety aspects of using MPI yokes
especially when used in conjunction with an inverter. Personnel should be trained in use and
precautions of the inverter which would then cross refer to the JSA. It is the responsibility of
the company and the technician to establish that use of this equipment complies with site
regulations.
Prior to carrying out MPI work the condition of the inverter, yoke and cable should be
inspected and if damaged should not be used. The RCD has a test facility and should be
regularly tested.
The unit is not waterproof [nor would the magnet be] and the unit is not designed for use in
hazardous atmospheres and if used should be used under the requirements of a hot work
permit.

http://www.safeworkaustralia.gov.au/sites/swa/about/publications/pages/managing-
electrical-risks-in-the-workplace

The RCD has two test buttons which should be checked regularly and an external
RCD tester [CABAC] can be used to establish that the trip point is 30mA or less.