Safety in Electrical Occupations--Summary / QUIZ

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++ Never work on an energized circuit if the power can be disconnected.

++ The most important rule of safety is to think.

++ Avoid horseplay.

++ Don’t work alone.

++ Work with one hand when possible.

++ Learn first aid and CPR.

++ 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 in the United States.

++ Avoid using alcohol and drugs in the workplace.

++ Don’t walk close to trenches unless it’s necessary.

++ Don’t jump over trenches if it’s possible to walk around them.

++ Place barricades around trenches.

++ Use ladders to enter and exit trenches.

++ When working in confined spaces, an outside person should keep in constant contact with people inside the space.

++ Lockout and tagout procedures are used to prevent someone from energizing a circuit by mistake.

++ Scaffolds generally provide the safest elevated working platforms.

++ The bottom of a straight ladder should be placed at a distance from the wall that is equal to one fourth the height of the ladder.

++ Fires can be divided into four classes: Class A is common items such as wood and 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.

++ GFCI protectors open the circuit when approximately 5 milliamperes of ground-fault current are sensed.

++ Arc-fault interrupters protect against electrical fires by sensing an arc-fault condition. Arc-fault circuit interrupters employ a microprocessor to sense an arc-fault condition.

++ NEC 250 lists requirements for grounding electrical systems.


1. What is the most important rule of electrical safety?

2. Why should a person work with only one hand when possible?

3. What range of electric current generally causes death?

4. What is fibrillation of the heart?

5. What is the operating principle of a defibrillator?

6. Who is responsible for enforcing OSHA regulations?

7. What is the mission of OSHA?

8. What is an MSDS?

9. A padlock is used to lock out a piece of equipment. Who should have the key?

10. A ladder is used to reach the top of a building 16 feet tall. What distance should the bottom of the ladder be placed from the side of the building?

11. What is a ground fault?

12. What is the approximate current at which a ground-fault detector will open the circuit?

13. Name three devices used to provide ground-fault protection.

14. What type of fire is Class B?

15. What section of the NEC covers grounding?

Section 1 Identity of Material Trade Name OATEY HEAVY DUTY CLEAR LO-VOC PVC CEMENT Product Numbers 31850, 31851, 31853, 31854 Formula PVC Resin in Solvent Solution Synonyms PVC Plastic Pipe Cement Firm Name and Mailing Address nnn CO., 4700 West 160th Street, P.O. Box 35906 Cleveland, Ohio 44135, U.S.A. nnn Phone Number 1-216-267-7100 Emergency Phone Numbers For Emergency First Aid call 1-303-623-5716 COLLECT. For chemical transportation emergencies ONLY, call Chemtrec at 1-800-424-9300 Prepared By Charles N. Bush, Ph.D.

Section 2 Hazardous Ingredients % Cas Number Sec 313 Acetone 0-5% 67-64-1 No Amorphous Fumed Silica (Nonhazardous) 1-3% 112945-52-5 No Proprietary (Nonhazardous) 5-15% N/A No PVC Resin (Nonhazardous) 10-16% 9002-86-2 No Cyclohexanone 5-15% 108-94-1 No Tetrahydrofuran (See SECTION 11) 30-50% 109-99-9 No Methyl Ethyl Ketone 20-35% 78-93-3 Yes TABLE S-1 Heavy Duty Clear LO-VOC PVC Cement Section 3 Known Hazards Under U.S. 29 CFR 1910.1200 Hazards Yes No Hazards Yes No Combustible Liquid x Skin Hazard x Flammable Liquid x Eye Hazard x Pyrophoric Material x Toxic Agent x Explosive Material x Highly Toxic Agent x Unstable Material x Sensitizer x Hazards Yes No Hazards Yes No Water Reactive Material x Kidney Toxin x Oxidizer x Reproductive Toxin x Organic Peroxide x Blood Toxin x Corrosive Material x Nervous System Toxin x Compressed Gas x Lung Toxin x Irritant x Liver Toxin x Carcinogen NTP/IARC/ OSHA (see SECTION 11) x Section 4 Emergency and First Aid Procedures-Call 1-303-623-5716 Collect Skin If irritation arises, wash thoroughly with soap and water.

Seek medical attention if irritation persists. Remove dried cement with Plumber's Hand Cleaner or baby oil.

Eyes--If material gets into eyes or if fumes cause irritation, immediately flush eyes with water for 15 minutes. If irritation persists, seek medical attention.

Inhalation--Move to fresh air. If breathing is difficult, give oxygen.

If not breathing, give artificial respiration. Keep victim quiet and warm. Call a poison control center or physician immediately. If respiratory irritation occurs and does not go away, seek medical attention.

Ingestion--DO NOT INDUCE VOMITING. This product may be aspirated into the lungs and cause chemical pneumonitis, a potentially fatal condition. Drink water and call a poison control center or physician immediately. Avoid alcoholic beverages. Never give anything by mouth to an unconscious person.

Section 5 Fire Fighting Measures Precautions--Don’t use or store near heat, sparks, or flames. Don’t smoke when using. Vapors may accumulate in low places and may cause flash fires.

Special Fire Fighting Procedures FOR SMALL FIRES: Use dry chemical, CO2, water or foam extinguisher.

FOR LARGE FIRES: Evacuate area and call Fire Department immediately.

Section 6 Accidental Release Measures Spill or Leak Procedures Remove all sources of ignition and ventilate area. Stop leak if it can be done without risk. Personnel cleaning up the spill should wear appropriate personal protective equipment, including respirators if vapor concentrations are high. Soak up spill with absorbent material such as sand, earth or other non-combusting material. Put absorbent material in covered, labeled metal containers.

Contaminated absorbent material may pose the same hazards as the spilled product. See Section 13 for disposal information.

Section 7 Handling and Storage Precautions HANDLING and STORAGE: Keep away from heat, sparks and flames; store in cool, dry place.

OTHER: Containers, even empties, will retain residue and flammable vapors.

Section 8 Exposure Controls/Personal Protection

Protective Equipment Types EYES: Safety glasses with side shields.

RESPIRATORY: NIOSH-approved canister respirator in absence of adequate ventilation.

GLOVES: Rubber gloves are suitable for normal use of the product. For long exposures to pure solvents, chemical-resistant gloves may be required.

OTHER: Eye wash and safety shower should be available.

Ventilation LOCAL EXHAUST: Open doors and windows. Exhaust ventilation capable of maintaining emissions at the point of use below PEL. If used in enclosed area, use exhaust fans. Exhaust fans should be explosion-proof or set up in a way that flammable concentrations of solvent vapors are not exposed to electrical fixtures or hot surfaces.

Section 9 Physical and Chemical Properties NFPA Hazard Signal Health 2 Stability 1 Flammability 3 Special None HMIS Hazard Signal Health 3 Stability 1 Flammability 4 Special None Boiling Point 151 ºF/66 ºC Melting Point N/A Vapor Pressure 145 mmHg @ 20 ºC

Vapor Density (Air = 1) 2.5 Volatile Components 70-80% Solubility In Water Negligible PH N/A Specific Gravity 0.95 +/-0.015 Evaporation Rate (BUAC = 1) = 5.5 - 8.0 Appearance Clear Liquid Odor Ether-Like Will Dissolve In Tetrahydrofuran. Material Is Liquid.


Also see: Electrical safety systems

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Monday, February 25, 2013 22:19