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
USNS Safeguard (T-ARS-50) up to 1,000 gallons per minute of seawater or aqueous film forming foam (AFFF) When originally built, "Safeguard" had a fourth remotely controlled fire monitor mounted on her forward kingpost, but this was later removed. "Safeguard" has a 3,600-gallon foam tank. In addition to the equipment carried by "Safeguard", the US Navy Supervisor of Salvage maintains a stock of additional emergency fly-away salvage equipment that can be deployed aboard the salvage ships to support a wide variety of rescue and salvage operations. During Operation Tomodachi, "Safeguard" was one of several ships participating in disaster relief after the 2011 Tōhoku earthquake