Session 5

Lesson 5

Why? To protect: People Property Against: Electrical Hazard Mechanical Hazard For: Inspections Repairs Maintenance

In the Procedure Protection of fellow workers via: A warning that the equipment in a particular area is being worked on and must not be operated or the area entered

Workcover Requires Only authorized persons with current rescue breathing certification should apply lockout and tag out devices

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation 4. Test for supply 5. Isolate 6. Danger Tag 7. Test 8. Test tester

Isolation Procedure Order 1. Assess the need Do you have the skills, qualifications, knowledge of the equipment to safely isolate a piece of equipment? Equipment is normally remote from the isolation point. Two people are generally required Have you done a risk assessment?

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority An isolation point may affect other machinery May create a dangerous situation on other processes that are interlinked Many companies require a “Clearance to Isolate” authorisation before isolation commences.

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation Can be many locations in the electrical installation Main Switch Circuit Protection Isolation switch near device Isolation point must be able to LOCKED OUT

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation 4. Test for supply Test equipment must comply with Australian Standards Tests that there is a supply to the device Be aware of automatic controlled equipment

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation 4. Test for supply 5. Isolate Isolation point must be able to LOCKED OUT

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation 4. Test for supply 5. Isolate 6. Danger Tag Two types of tag: Danger & Out of Service Must be installed in such a way that it has to be removed to operate isolation point

Out of Service Used to Protect Equipment Only Can be removed by anybody with authorisation Can stay on equipment until repaired or replaced

Personal Danger Used to Protect Life Can only be removed by the person who placed it there Has to be removed when worker leaves danger area

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation 4. Test for supply 5. Isolate 6. Danger Tag 7. Test Confirms that the correct isolation point has been used Test equipment must comply with Australian Standards Measure between: Active & Neutral Active & Earth + Exposed Conductive parts or Ground Active & Other Actives

Isolation Procedure Order 1. Assess the need 2. Notify affected people/Seek authority 3. Method of isolation 4. Test for supply 5. Isolate 6. Danger Tag 7. Test 8. Test tester Confirms that tester is functioning correctly

Caution Why is the ‘attempt to operate’ isolation procedure not an effective method of verifying that a circuit is de-energized? mechanical failure of a switch contact cannot be determined by the ‘attempt-to-operate’ method

List the three factors required for combustion; Classify fires according to the type of combustible material involved; Identify the types of fire extinguishers suitable for fighting electrical fires; List the procedures to follow in the event of a fire; Carry out correct fire fighting techniques in putting out an electrical fire; List the correct first aid treatment for treating burn injuries; List the procedures for handling PCBs.

What are the three components that are required for a fire to exist? FUEL OXYGEN HEAT

Fires are classified by the fuel type Class A Class B Class C Class D Class E Class F Wood Paper Cloth Flammable liquids Flammable Solids Flammable Gasses Combustible Metals Electrical Fires Cooking Fats or Oils Sodium Titanium Magnesium Potassium Steel Uranium Lithium Plutonium Calcium

ABE Dry Chemical Ammonium phosphate It receives its class A rating from the agent's ability to melt and flow at 177°C to smother the fire More corrosive than other dry chemical agents

BC Dry Chemical Sodium bicarbonate Potassium bicarbonate Potassium bicarbonate & Urea Complex Potassium Chloride

Vaporising Liquid Acts like liquid but “evaporates” leaving no residue Computer server rooms Data centres Areas housing sensitive electronic Equipment Originally designed to fight fires in the highly delicate environments of hospital MRI rooms