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* Covers or barriers must be installed on boxes , fittings , <br /> and enclosures to prevent accidental contact with live <br /> parts . <br /> Electrical - Wiring methods and devices : <br /> * Flexible cords may be used in place of any of the <br /> permanent wiring methods for temporary work . 2500 . 7 <br /> * Flexible cord cannot be spliced except for No . 12 (or <br /> larger) Type S . 2500 . 9(a) <br /> * Skirted attachment plugs must be used on all equipment <br /> operating at more than 300 volts . 2510 . 2(b) . <br /> Electrical - Generators : <br /> A portable or vehicle-mounted generator need not be grounded <br /> if it energizes only attached equipment , or if its <br /> receptacles ' grounding terminals are bonded to the vehicle <br /> frame, the generator , and the plugged in equipment . 2395 . 6 . <br /> Tools : <br /> * Tools must be kept clean and in good repair . 1699(a) <br /> * Only trained or experienced employees may operate tools , <br /> machines , or equipment . 1510(b) . <br /> Control switches (Powered hand tools) : <br /> The following tools must be equipped with a constant contact <br /> ' on-off ' switch : 1707 (a) ( 1 ) : <br /> * Dri 1 is <br /> * Tappers <br /> * Fastener Drivers <br /> * Grinders <br /> * Disc and Belt Sanders <br /> * Reciprocating and Saber Saws <br /> * Tools similar to those above <br /> Concrete finishing tools : <br /> Concrete finishing tools must be equipped with a dead-man <br /> type control . 1698(d) <br /> Page - 20 <br />