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Coex Training

Arc Flash/Arc Blast PPE

The incident energy determined at each assessable location will fall within a defined arc flash/arc blast PPE category, as defined in the table below. Incident Energy PPE Category Cal/cm2 >1.2 to 4 1 >4 to…

Arc Flash/Arc Blast Hazard Labels

Arc flash/arc blast hazard labels inform personnel of the arc flash/arc blast hazard and the required PPE at each switchboard or arc flash/arc blast hazard location. The labels should present the following information: electrical hazard…

HV in Port Hedland

Arc Flash/Arc Blast Risk Assessment

The likelihood of an arc flash/arc blast event is dependent upon the type of activity being undertaken at the time. It is generally accepted that the greatest likelihood occurs when there is direct interaction by…

Consequences of Arc Flash/Arc Blast

Arc faults are potentially fatal to any personnel in the vicinity. The intense heat of the arc flash/arc blast can severely burn human skin and ignite the clothing of anyone within several feet of the…

SAD - no go zone diagram

Understanding Safe Approach Distance/SAD

The safe approach distance (SAD) is based on an “exclusion zone” principle. This principle defines an area around an exposed conductor into which no part of the person, mobile plant or object (other than approved…

Arc Flash/Arc Blast & Their Causes

An arc flash/arc blast is a dangerous electrical plasma explosion created by a short circuit through air that causes electric current to flash over from one exposed conductor to another or to ground. An arc…

high voltage training at Coex Training

Electrical Safety

The main considerations of safe working procedures on electrical equipment are to ensure safety of workers and safety of the general public. In addition to this, the continuity of supply, and the welfare of plant…

Fault Current - High Voltage

Fault Current

Power systems are effectively earthed by the neutral points being connected directly to earth. The only resistance being the inherent resistance of the connections and the earth itself. A system fault comprises either one or…

Operating High Voltage Equipment - Coex

High Voltage Equipment Rating

Most high voltage distribution equipment has four basic ratings – service voltage; basic insulation level; rated current carrying capacity; and fault capacity. Service voltage The IEC sets standards for manufacturers to produce cables and switchgear…

Substations

Substations, switchyards and switch rooms are hazardous areas but only become dangerous if procedures are not strictly followed. The safety of personnel is the paramount consideration in the operation of any power system. Substations are…