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OSHA Region 1 Cooperative and State Programs Electrical Training/Inspection Roll Up Extension Cords GFCIs Power tools.

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Presentation on theme: "OSHA Region 1 Cooperative and State Programs Electrical Training/Inspection Roll Up Extension Cords GFCIs Power tools."— Presentation transcript:

1 OSHA Region 1 Cooperative and State Programs Electrical Training/Inspection Roll Up Extension Cords GFCIs Power tools

2 Electrical Training/Inspection Electrical equipment, cords and power tools are used in all industry settings Improper use can result in serious injury or death Estimated 4,000 injuries associated with extension cords (CPSC) In most cases GFCIs were not used Ungrounded cords were used Improperly repaired or modified cords used

3 Wire used depends on operation, building materials, electrical load, and environmental factors Wire used depends on operation, building materials, electrical load, and environmental factors Use the correct extension cord Use the correct extension cord Use the Correct Wire Must be 3-wire type and designed for hard or extra-hard use

4 Clues that Electrical Hazards Exist Tripped circuit breakers or blown fuses Tripped circuit breakers or blown fuses Warm tools, wires, cords, connections, or junction boxes Warm tools, wires, cords, connections, or junction boxes GFCI that shuts off a circuit GFCI that shuts off a circuit Worn or frayed insulation around wire or connection Worn or frayed insulation around wire or connection

5 Defective Cords & Wires Plastic or rubber covering is missing from caps Plastic or rubber covering is missing from caps Open wiring used as extension cord Open wiring used as extension cord Damaged extension cords & tools Damaged extension cords & tools

6 Damaged Cords Cords can be damaged by: Cords can be damaged by: Aging Aging Door or window edges Door or window edges Staples or fastenings Staples or fastenings Abrasion from adjacent materials Abrasion from adjacent materials Activity in the area Activity in the area Improper use can cause shocks, burns or fire Improper use can cause shocks, burns or fire

7 Improper Grounding Tools plugged into improperly grounded circuits may become energized Tools plugged into improperly grounded circuits may become energized Broken wire or plug on extension cord Broken wire or plug on extension cord Some of the most frequently violated OSHA standards Some of the most frequently violated OSHA standards

8 Flexible cords protected from damage Flexible cords protected from damage Avoid sharp corners Avoid sharp corners Extension cords 3-wire type Extension cords 3-wire type Rated Hard or extra-hard duty Rated Hard or extra-hard duty Wiring methods, components, and equipment for general use.

9 Most flat type extension cords are molded and not rated for hard or extra- hard use and can not be used at work. Even if it has a UL label - this flat, molded and ungrounded cord can not be used at work.

10 Flexible cords Flexible cords shall be connected to devices and fittings so that strain relief is provided. (Caps may be replaced if damaged) Even though proper ratings of the cord and caps are used flexible cords can not be spliced in this manner.

11 All conductors singularly identifiable All conductors singularly identifiable No reversing polarity on conductors No reversing polarity on conductors Wiring Design and Protection Reversed polarity is a condition when the grounded conductor (neutral) is incorrectly connected to the ungrounded (hot) terminal of a plug, receptacle, or other type of conductor.

12 Unless listed or identified for use no conductors or equipment located in: Unless listed or identified for use no conductors or equipment located in: Damp or wet locations Damp or wet locations Harmful chemicals, fumes or vapors Harmful chemicals, fumes or vapors Excessive temperatures Excessive temperatures Environmental deterioration of equipment.

13 Listed, labeled or certified equipment shall be installed and used in accordance with their instructions. Knockout type boxes are not listed/labeled to be used as extension cords or pendants. Multi tap outlets need to be approved for their use. This one can not be used on construction sites.

14 Extension cords can be abused Damage to insulation and conductors can occur if the cord is improperly wound.

15 A GFCI is not an overcurrent device like a fuse or circuit breaker. A GFCI is not an overcurrent device like a fuse or circuit breaker. GFCIs are designed to sense an imbalance in current flow over the normal path. GFCIs are designed to sense an imbalance in current flow over the normal path. Ground fault circuit interrupters (GFCIs)

16 GFCI contains a special sensor that monitors the strength of the magnetic field around each wire in the circuit when current is flowing. GFCI contains a special sensor that monitors the strength of the magnetic field around each wire in the circuit when current is flowing. The field is proportional to the amount of current flow. The field is proportional to the amount of current flow.

17 If the current flowing in the black (ungrounded) wire is within 5 milliampers of the current flowing in the white (grounded) all the current will flow in the normal path. If the current flowing in the black (ungrounded) wire is within 5 milliampers of the current flowing in the white (grounded) all the current will flow in the normal path. If the current flow differs by more than 5mA, the GFCI will quickly open the circuit. If the current flow differs by more than 5mA, the GFCI will quickly open the circuit. Ground fault circuit interrupters (GFCIs)

18

19 Circuit Breaker type: Circuit Breaker type: Includes the functions of a standard circuit breaker with the additional function of a GFCI. Includes the functions of a standard circuit breaker with the additional function of a GFCI. Installed in a panelboard and can protect an entire branch circuit with multiple outlets. Installed in a panelboard and can protect an entire branch circuit with multiple outlets. A direct replacement for a standard circuit breaker of the same rating. A direct replacement for a standard circuit breaker of the same rating. Types of GFCIs

20 Receptacle type: Receptacle type: Incorporates within one device one or more receptacle outlets, protected by the GFCI. Incorporates within one device one or more receptacle outlets, protected by the GFCI. Popular and inexpensive. Popular and inexpensive. Most are of duplex type Most are of duplex type Can protect additional non-GFCI type receptacles connected downstream. Can protect additional non-GFCI type receptacles connected downstream. Types of GFCIs

21 Permanently Mounted type: Permanently Mounted type: Mounted in an enclosure and designed to be permanently wired to the supply. Mounted in an enclosure and designed to be permanently wired to the supply. Frequently used around commercial swimming pools or similar wet locations. Frequently used around commercial swimming pools or similar wet locations. Types of GFCIs

22 Portable type: Portable type: Some plug directly into non-GFCI outlets. Some plug directly into non-GFCI outlets. Incorporate no-voltage release device which will disconnect power to the outlets if any supply conductor is open. Incorporate no-voltage release device which will disconnect power to the outlets if any supply conductor is open. Units for outdoor use will be in suitable enclosure. Units for outdoor use will be in suitable enclosure. Will be listed if for rain use. Will be listed if for rain use. Types of GFCIs

23 Cord Connected type: Cord Connected type: Attachment plug incorporates the GFCI module. Attachment plug incorporates the GFCI module. Protects the cord, and any equipment attached to the cord. Protects the cord, and any equipment attached to the cord. Attachment has non-standard appearance Attachment has non-standard appearance Equipped with test and reset buttons. Equipped with test and reset buttons. No-voltage release feature No-voltage release feature Types of GFCIs

24 GFCI s are complex mechanisms, they must be tested on a regular basis. GFCI s are complex mechanisms, they must be tested on a regular basis. For permanently mounted types, once a month testing is recommended. For permanently mounted types, once a month testing is recommended. Portable GFCI s should be tested before each use. Portable GFCI s should be tested before each use. GFCI s have a test-circuit which imposes an artificial ground fault when the test button is pushed. GFCI s have a test-circuit which imposes an artificial ground fault when the test button is pushed. Testing GFCIs

25 Push test button and make sure the GFCI trips. (A click will be heard ) Push reset button and make sure the GFCI is activated. A click will be heard

26 Power Tools - Precautions Disconnect tools when not in use, before servicing and cleaning, and when changing accessories Disconnect tools when not in use, before servicing and cleaning, and when changing accessories Keep people not involved with the work away from the work Keep people not involved with the work away from the work Secure work with clamps or a vise, freeing both hands to operate the tool Secure work with clamps or a vise, freeing both hands to operate the tool Dont hold the switch button while carrying a plugged- in tool Dont hold the switch button while carrying a plugged- in tool Remove damaged electric tools & tag them: Do Not Use Remove damaged electric tools & tag them: Do Not Use

27 Consider what you wear – loose clothing and jewelry can get caught in moving parts Consider what you wear – loose clothing and jewelry can get caught in moving parts Keep tools sharp and clean Keep tools sharp and clean Use PPE, such as safety glasses, goggles, face shield, gloves, hearing protection, respirator, hard hat Use PPE, such as safety glasses, goggles, face shield, gloves, hearing protection, respirator, hard hat Power Tools - Precautions

28 Power Tools – Precautions Electric Cords Dont carry portable tools by the cord Dont use electric cords to hoist or lower tools Dont yank cord or hose to disconnect it Keep cords and hoses away from heat, oil, and sharp edges

29 To protect a worker from shock, these tools must: have a 3-wire cord plugged into a grounded receptacle be double insulated, or be powered by a low-voltage isolation transformer Electric Power Tools Double insulated markings Plug with a grounding pin

30 Grounding Grounding creates a low- resistance path from a tool to the earth to disperse unwanted current. Grounding creates a low- resistance path from a tool to the earth to disperse unwanted current. When a short or lightning occurs, energy flows to the ground, protecting you from electrical shock, injury and death. When a short or lightning occurs, energy flows to the ground, protecting you from electrical shock, injury and death.

31 Ground Tools & Equipment Ground power supply systems, electrical circuits, and electrical equipment Ground power supply systems, electrical circuits, and electrical equipment Frequently inspect electrical systems to ensure path to ground is continuous Frequently inspect electrical systems to ensure path to ground is continuous Inspect electrical equipment before use Inspect electrical equipment before use Dont remove ground prongs from tools Dont remove ground prongs from tools or extension cords or extension cords Ground exposed metal parts of Ground exposed metal parts of equipment equipment

32 Tool Safety Tips Dont carry a tool by the cord Dont carry a tool by the cord Dont yank the cord to disconnect it Dont yank the cord to disconnect it Keep cords away from heat, oil, & Keep cords away from heat, oil, & sharp edges sharp edges Disconnect when not in use and when changing Disconnect when not in use and when changing accessories such as blades & bits accessories such as blades & bits Remove damaged tools from use Remove damaged tools from use

33 Hazards are usually the result of improper tool use or not following one or more of these protection techniques: Inspecting the tool before use Inspecting the tool before use loose clothing and jewelry can get caught in moving parts loose clothing and jewelry can get caught in moving parts Use PPE, such as safety glasses, goggles and gloves Use PPE, such as safety glasses, goggles and gloves Using guards Using guards Properly storing the tool Properly storing the tool Using safe handling techniques Using safe handling techniquesSummary


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