Safety Overview

1
Safety Overview

• Objectives
• State basic safety rules.
• Describe the effects of electric current on the
  human body.
• Discuss the responsibilities of OSHA.
• Discuss lockout and tagout procedures.

2
Safety Overview

• Objectives
• Explain proper placement of a straight ladder.
• Discuss the use of scaffolds.
• Discuss classes of fires.
• Discuss ground-fault circuit interrupters.
• Discuss the importance of grounding.

3
Safety Overview

• General Safety Rules
• THINK FIRST! This is the most important safety
  rule!
• Never work on an energized circuit if it is
  possible to disconnect the power.
• Avoid horseplay.
• Do not work alone.
• Work with one hand when possible.
• Learn first aid and CPR.

4
Safety Overview

• General Safety Rules
• The OSHA mission is to ensure safe and healthy
  workplaces.
• Avoid using alcohol and drugs in the workplace.
• Avoid walking close to trenches.
• Dont jump over trenches, walk around them.
• Place barricades around trenches.

5
Safety Overview

• General Safety Rules
• Use ladders to enter and exit trenches.
• Always maintain an outside person to monitor
  people working in confined spaces.
• Lockout and tagout procedures prevent accidental
  energizing of circuits.
• Scaffolds provide the safest elevated working
  platform.

6
Safety Overview
A safety tag used to tagout equipment.
7
Safety Overview
The OSHA lockout and tagout procedures prevent
electrical accidents!
8
Safety Overview

• General Safety Rules
• A straight ladder should be positioned so that
  its bottom is placed away from the wall a
  distance of ¼ the vertical height of the ladder
  where it touches the wall.
• Ground-fault circuit interrupters (GFCI) are used
  to protect people from electrical shock.
• NEC? 250 refers to grounding requirements.

9
Safety Overview
Effects of electric current on the human body.
10
Safety Overview
A GFCI device monitors both the hot and neutral
currents. These currents should be equal!
11
Safety Overview
Unequal currents may mean an unwanted pathway
through a person! This is a ground fault.
12
Safety Overview
One type of GFCI device is a special circuit
breaker.
13
Safety Overview
Another type of GFCI device is a special
receptacle.
14
Safety Overview

• Fires can be divided into four classes
• Class A wood and paper
• Class B grease, liquids, and gases
• Class C energized electric equipment
• Class D metals

15
Safety Overview

• Review
• Never work on an energized circuit if it is
  possible to disconnect the power.
• Avoid horseplay.
• The most important rule of safety is to think
  first.
• Do not work alone.
• Work with one hand when possible.

16
Safety Overview

• Review
• A current of 100 to 200 milliamperes passing
  through the heart generally causes death.
• The mission of OSHA is to ensure safe and healthy
  workplaces.
• Learn first aid and CPR.
• Avoid using alcohol and drugs in the workplace.

17
Safety Overview

• Review
• Dont walk close to trenches unless it is
  necessary.
• Dont jump over trenches walk around them.
• Place barricades around trenches.
• Use ladders to enter and exit trenches.

18
Safety Overview

• Review
• When working in confined spaces, an outside
  person should keep in constant contact with the
  people inside the space.
• Lockout and tagout procedures are used to prevent
  someone from energizing a circuit by mistake.

19
Safety Overview

• Review
• The bottom of a straight ladder should be placed
  a distance from the wall equal to one fourth the
  height where the top of the ladder makes contact
  with the wall.
• Scaffolds generally provide the safest elevated
  working platform.

20
Safety Overview

• Review
• Fires can be divided into four classes Class A
  is common items such as wood or paper Class B is
  grease, liquids, and gases Class C is energized
  electric equipment and Class D is metals.
• Ground-fault circuit interrupters are used to
  protect people from electric shock.

21
Safety Overview

• Review
• GFCI protectors open the circuit when
  approximately five milliamperes of ground-fault
  current are sensed.
• NEC 250 lists the requirements for grounding
  electrical systems.