Electrical wiring in the United Kingdom lawnmower does it need an RCD?" The risk of electrical shock on construction sites can be reduced by several measures, including reduction of the normal 230 volt distribution voltage to 110 volts for electrical lighting and power tools. By using a centre-tapped transformer, each conductor of the circuit is only at 55 volts with respect to earth. This reduces the chance of dangerous electrical shock when using power tools in wet locations. Where 230 volts must be used, a residual current device (RCD) can be used to detect small leakage currents and automatically isolate faulty equipment. In sites where hazardous
Safeguard Program debate among historians and political commentators. Through the Safeguard era, talks between the US and Soviet Union originally started by Johnson were continuing. The Anti-Ballistic Missile Treaty of 1972 limited the US and Soviet Union to two ABM sites each. Safeguard was scaled back to sites in North Dakota and Montana, abandoning initial work at a site in Missouri, and cancelling all other planned bases. Construction on the two remaining bases continued until 1974, when an additional agreement limited both countries to a single ABM site. The Montana site was abandoned with the main radar partially completed. The remaining base