02-07-2012, 11:54 AM
Electrical Safety in Construction
Electrical Safety.ppt (Size: 2.18 MB / Downloads: 214)
Common Electrical Hazards
Electric shock/electrocution occurs when current flows through the body damaging the body.
Electrical burns are caused by arc blast or hot conductors.
Indirect falls from ladders, scaffolds, or other walking and working surfaces.
Explosions can be caused when electricity provides a source of ignition for an explosive mixture in the atmosphere.
Fires are caused by overloading a circuit or appliance or by current flowing through
high resistance due to faulty
wiring, setting fire to insulation
and surrounding materials.
General Requirements
Listed, labeled, or certified equipment must be installed and used in accordance with instructions included in the listing, labeling or certification.
Splices
Splicing devices suitable for use
Welding/brazing/soldering
Mechanically/electrically secure before soldering
Covered with insulation equivalent to that of the conductors
Insulating device suitable for purpose
Wiring Design and Protection
Employer shall use either ground fault circuit interrupters, or
An assured equipment grounding conductor program to protect employees
Portable generators need not be grounded if:
Supplies only equipment
mounted on the generator
and/or cord and plug
equipment is plugged into
receptacle mounted on the
generator
Noncurrent-carrying metal
parts of equipment and
grounding conductor
terminals of the receptacle
are bonded to generator frame