Projects

Clinical Engineering Projects

 

Bollards for Mobile Medical units.

Back in 2009 with the roll out of the oral health procurement programme in the individual DHB’s, the new mobile dental units required connection for water ,power ,internet & drainage. DHBNZ at the time were not interested in providing a standardised connection bollard across NZ and so individual DHB’s addressed the connections in different ways. Also a year earlier the new standard for mobile medical electrical connection  NZS 6115:2006  was released by Standards NZ.

This briefly shows the development of a mobile dental bollard system by the Southern DHB.
With the development & identification of the mobile dental parking pads at the chosen sites the need for secure potable water, safe drainage ,Ethernet connection  and 3 phase & single phase power outlet sockets. Advice was gained on the Jackson Electrical’s marina type outlets protected by RCD’s. Attempts were initially made to reduce costs by not having water and drainage available, but it quickly was recognized that this would not work well  and a secure bollard meeting all services was needed
The mark I bollard was made locally from marine stainless steel and meet most requirements with both single & 3 phase outlets, Kw/h meter ,circuit breakers ,RCD Ethernet RJ45 socket , backflow preventer, tamper proof water tap, and gully trap with capped hose socket for drain.
Access for the 32A 3 phase cable + Ethernet industrial cable was from a weather hood & closing door. The front of the bollard had large opening door which was locked by tamper key & a padlock.
The mark II unit made from quality marine stainless in lower Hutt was a refinement on the MkI and provided a neat robust bollard meeting the requirements of NZS 6115:2006 and the water regulations around supply of water to a mobile medical unit.
The Southern DHB considered the issue of  backflow prevention on the potable water supplies and decided that despite testing, maintenance and climatic conditions it was best to fit the backflow preventer to the rear of the bollard. Handy toby boxes have the main water valve and optional valve to drain the system during winter.
The units are fully earthed installations.  32A 30mA RCD are provided along with miniature circuit breakers and the all important digital kW/h meter to allow schools to recover power costs.
The single phase 32A  PDL IP64 socket is provided for our older mobile , repair tooling and also powering data hubs.
The Southern DHB stuck with ISO standard IP64 3phase 5 pin “scame type”plug which has proved a good choice in light of the NZ electrical regulations & durability.