Contributing factors

The defective plug was an international type (‘CEE form’ Type 2175 to BS4343) typically used on refrigerated containers using three-phase 41 5V supplies for in-transit and overnight refrigeration. It has an aligning or locating lug moulded onto the outside of the collar that shrouds the pins. The lug is about 4-5mm wide and 2-3mm high and extends about 10mm along the collar. It was broken off.

The socket into which the plug was inserted was an Australian ‘Clipsal’ type 56C432 32-amp rating. There were no observable defects associated with the Clipsal socket. The diameter of the individual pin-socket is such that the earth pin of the defective plug can unwittingly be forced into an active pin socket if the lug is broken off.

The correct practice for connecting refrigerated containers to Australian-type threephase socket outlets is to use an adaptor leads, which adapts the ‘international’ plug to the Australian socket.

Above: The male plug has had the locating key ground off to allow it to fit any 415v female plug.

Recommendations

Truck operators, transit and storage operators, supervisors and truckyard workers need to be aware:

• An adaptor is required to connect between international plugs used on containers and Australian-supplied three-phase 415V sockets.
• A serviceable plus must replace a defective one.
• Anyone deliberately removing the aligning lug may be liable for prosecution under workplace health and safety legislation incurring the maximum fine in NSW of \$25,000.

Further information

For more information call WorkCover’s Information Centre on 13 10 50.

Safety Alert No: 4013                                Date of Issue: 01 November 1993