Electric blasting caps may not be used where extraneous electricity makes them dangerous, and cap leg wires stay shunted until connected into the firing circuit. Before adopting any electrical firing system the blaster must survey thoroughly for extraneous currents and eliminate any dangerous currents before holes are loaded. Every electric cap in one blast must come from the same manufacturer and share the same style or function. Firing through blasting or power circuits must follow the recommendations of the cap manufacturer, or of an approved contractor or its designated representative, with enough delivered current per the manufacturer. Connecting and lead wires must be insulated single solid wires, bus wires solid single wires, each of sufficient current capacity, and firing line insulation must be adequate and in good condition. A power circuit used to fire caps may not be grounded. In underground work where shots are fired from a power circuit, safety switches that lock only in the Off position and short-circuit the lines to the cap circuit must be installed at intervals along the permanent firing line, and a lightning gap of 5 feet or more must separate the main firing switch from the power source, bridged by a flexible jumper cord only just before firing. The firing switch on any power circuit must be locked open or Off except when firing, must automatically short the firing lines when Off, and its keys are entrusted only to the blaster. Blasting machines must be in good condition and periodically tested to confirm they deliver rated power; connections follow the cap manufacturer's recommendations; the number of caps may not exceed the machine's rated capacity, and in primary blasting a series circuit may hold no more caps than the manufacturer recommends. The blaster is in charge of blasting machines and nobody else connects leading wires to them. Circuits to charged holes are tested only with blasting galvanometers or other purpose-designed instruments. Where blast force could throw a leading line or wire over a live power line, wires must be kept too short to reach or be anchored to the ground, and if neither is possible a nonelectric system is used. Only the person making leading wire connections fires the shot; connections are made from the hole back toward the power source, and leading wires stay shorted and disconnected until the moment of firing. Once a blasting machine has fired a shot, its leading wires must be unhooked at once and short-circuited.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.