Causes of Arc Flash – Electrical Incident

 


Causes of Arc Flash – Electrical Incident


Causes of Arc Flash – Electrical Incident


Part 2 ADNOC & GULF HSE Interview

Questions & Answer




RISK MANAGEMENT ( With Pictures )


Arc flash/Arc blast both are a serious incident electrical maintenance or condition monitoring which is having high potential for the employee life and property damage. This incident happen due to many causes which is explained here to control such incidents in industry. An arcing fault is the flow of current through the air between phase conductors or between conductors and a neutral or ground.

An arcing fault can be caused by many number of things, ranging from faulty panel wiring to simply dropping a non insulated screwdriver or other tools inside a live panel.

The energy that results from an arcing fault manifests as an arc flash, an arc blast or a combination of the two, which is very dangerous to human safety.

 

3 - WORK AT HEIGHT PRECAUTIONS - 

PICTORIAL TRAINING ( 3 )


An arc flash can be spontaneous or result from inadvertently bridging electrical contacts with a

conducting object. Other causes may include dropped tools or the buildup of conductive dust or corrosion. An electric arc flash can occur if a conductive object gets too close to a high-amp current source or by equipment failure (for instance, while opening or closing disconnects).

Conditions under which arc flash can occur:

Human Error, which is considered the most common cause:

Dropped or unintentional contact with live circuit with non-insulated tool or conductive object

Improper installation of equipment

Negligent or improperly done preventive maintenance

Failure to de-energize equipment whenever possible

Working on live equipments



FREE - Training Module on PERMIT TO WORK



Equipment Failure:

Due to failure of electrical equipment and or system design

Due to faulty system design

Spontaneous:

Buildup of conductive dust

Corrosion

Moisture or conductive liquids/vapor

Animal contact (rodent, snake, bird, etc.)

Example of incident:

A worker was injured while laying block for a surface electrical installation. He was cleaning the mortar joints with a piece of metal conduit when the conduit fell through the top of a 660 VAC panel, causing a short.


UN SAFE ACTS – 2



CONTROL MEASURES FOR HOT WORK




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