Causes of Electrical Fires

Causes of Electrical Fires Points : causes of electrical fires, fires in electrical power stations/substations/plants are caused by one or more of the following As per philosophy of safety management, the root cause behind occurrence of an accident is either.
(1) Lapse in Safety Management. Several acts of negligence, carelessness usually accumulate and increase the fire hazard, e.g., lack of house keeping, poor quality of wiring, old and worn out equipment not replaced, loose connections not repaired, gas leaks ignored, poor quality of testing and maintenance.
(2) Human Error/Negligence Lack of awareness, Lack of training.
(3) Accident beyond human control.

Case Studies of Electrical Accidents

Case Studies of Electrical Accidents Points : case studies of electrical accidents

Case Studies of Electrical Accidents Location / Installation Incidence Remarks A. residence or shop 1). House-person gets electrocuted by touching live immersion heater. - Lack of awareness - Unsafe appliance - Precautions by-passed - Careless use - Unsafe exposed appliance - Defective appliance - Not earthed - Improper installation - Sparking in loose connection and surrounding inflammable material. - Overheating of conductor and burning of insulation

Electrical Hazards in Industrial Systems

Electrical Hazards in Industrial Systems Points : electrical hazards in industrial systems

Hazards in Electrical Incidence, Condition Effect 1. Person touches live conductor or charged conductor Electric shock 2. Person touches faulted structure or any metal part Electric shock 3. Person touches faulted equipment enclosure Electric shock

Classification of Electrical Fires

Classification of Electrical Fires Points : classification of electrical fires, class of electrical fires, types of electrical fires

CLASSIFICATION OF FIRES Fire Class Combustion Material Involved Fire Extinguishing Medium 1. Class A Fire Fires involving Ordinary Solid Materials such as Wood, Coal, Plastics, Cloth, paper, Rags, Rubbish, Construction and Packing materials, Rubber, etc. Water or Solution with high water content cooling and wetting of material helps in quenching the fire. 2. Class B Fire Fires involving Flammable Iiquids/Vapours/Solventss: Transformer oil, Diesel oil, Solvents, Liquid chemicals Lubricating oils, Paints/Varnishes/thinners Greases, Contained Uncontained. Limiting air or oxygen supply, inhibiting fire Dry chemicals, Foam, Halon. Water is not suitable.

General Electrical Preventive Methods

General Electrical Preventive Methods Points : general electrical preventive methods 1) All voltages should be considered dangerous even though voltage may not be high enough to produce serious shock.
2) All electrical circuits should be treated as live and no work should be carried out on any part of electrical apparatus for circuits unless such parts are:
(a) Dead
(b) Isolated and all practical steps taken to lock off from live conductors.
(c) Efficiently connected to earth at all points of disconnection of supply to such apparatus, or between such points and point of work.
(d) Release for work by issue of release of work permit or other tags.

Hazards and Fire

Hazards and Fire Points : hazards and fire, safety against rotating machine hazards general measures should be adopted Safety against Rotating Machine Hazards General Measures Should Be Adopted Rotating machine is a machine which has one or several rotating parts. An electric motor has rotating part and is actually a rotating machine but it is not called a machine; it is called a motor. This motor drives many machines which have rotating parts and are called rotating machines.

As there are many types and sizes of rotating machines so there are many types of rotating machine hazards. For example there are hazards of exposed gear wheel, of unguarded circular saw, of unguarded belts and V-belts, of unguarded pneumatic conveyors, of unguarded feeding points, of unguarded rollers and of unguarded hairs etc,

Before enumerating rotating machine hazards and describing measures of preventing them it will be worth while to have at least a broad concept of the.
a) Operation of rotating machines, and
b) Size of such machines