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
USS Safeguard (ARS-25) Mare Island, California. After service in the Aleutians in the spring of 1947, "Safeguard" arrived at Pearl Harbor on 1 July. She then went on to Kwajalein Atoll, the Marshalls, for salvage operations after the nuclear tests held there. The mission involved considerable diving and the inspection of the underwater surfaces of many grounded vessels. "Safeguard" departed Kwajalein on 12 November and headed via Pearl Harbor for San Diego. She decommissioned on 12 December 1947 and entered the San Diego Group of the Pacific Reserve Fleet. After the outbreak of war in Korea, "Safeguard" was ordered activated. Recommissioned on 13