Operation Totem Cockcroft, the director of the Atomic Weapons Research Establishment at Harwell personally lodged a formal request for a feasibility study with the Prime Minister of Australia, Robert Menzies, at a meeting on 4 September 1952. Other matters discussed included the attendance of Butement and Leslie Martin, the Australian Defence Scientific Adviser, as Australian observers at the Hurricane test, the creation of the Australian Atomic Energy Commission, and the supply of Australian uranium to the UK. Cockcroft reported to Sir Roger Makins at the Foreign Office that Menzies had agreed in principle to Penney's reconnaissance of the Emu Field site. Penney
Residual-current device to the appliance. The test button (8) allows the correct operation of the device to be verified by passing a small current through the orange test wire (9). This simulates a fault by creating an imbalance in the sense coil. If the RCD does not trip when this button is pressed, then the device must be replaced. Residual-current and overcurrent protection may be combined in one device for installation into the service panel; this device is known as a GFCI (ground fault circuit interrupter) breaker in the USA and Canada, and as an RCBO (residual-current circuit breaker with overload protection)