1. Electrical Safety and Electrical Safe Work Practices EHS Course #525 Reference EHS Electrical Safety Procedure 75-44

2. Why Electrical Training?

3. What Problems Do You See in Your work area?
Damaged plug
Missing ground pin
Shorted out – the missing prong was found still in the outlet...
Why is a missing ground pin a problem?
Missing ground pin: If there is any damage to the internal electrical wiring, the exterior of the equipment can become energized. The Ground provides a path back through the circuit breaker, that will cause the circuit breaker to trip. Without the ground pin, you risk becoming the path for the electricity...

4. What Problems Do You See in Your work area?
Damaged GFCI outlet
Why didn’t the GFCI prevent the damage?
The GFCI device measures the current flow out on the hot lead, and returning on the neutral lead. They should be equal. If not, the GFCI trips. In this case, the short happened between the hot lead and the neutral lead, so the GFCI did not trip!

5. What Problems Do You See in Your work area?
Spliced and taped cord on a lamp – fire and electrocution hazard

6. Don’t do this at home.....
Not at BD – this picture is from the internet.

7. Home Electrical Safety
Never use lights with frayed cords, loose or bare wires, cracked or empty sockets.
Do not connect more than 3 light sets together & do not overload extension cords (use an outlet strip with built-in overload protection).
Turn off all Christmas lights prior to leaving your
home or going to bed.
Use only equipment that is UL listed and in good repair.
Do not use candles on or near your tree.
Test your smoke and carbon monoxide detectors, replace batteries.
If outdoors, use only electrical decorations certified for outdoor use & keep clear from snow and water & use GFCI protected circuit.
Plug lights & decorations into circuits protected by GFCIs (ground fault circuit interrupters).

8. Installations NFPA/NEC 70 (National Electrical Code)
All installations at BD shall meet the following code minimum requirements:
NFPA/NEC 70 (National Electrical Code)
NFPA 79 (Electrical Standard for Industrial Machinery)
NOTE: If you don’t know what these two codes are, AND what they require, you have no business working on electrical equipment or opening an electrical cabinet…
ONLY qualified Facilities Electricians may work on building electrical systems…
Only qualified Electro-mechanics and qualified Engineers may work on production equipment electrical systems and components
NFPA 79: Electrical Standard For Industrial Machinery (2002)
NFPA 70: National Electrical Code (2005)

9. Why Follow the Rules? Electrical shock Arc Flash hazard
What is the highest voltage on production equipment here at BD – Sandy?
When was the last electrical shock incident (other than static electricity) at BD – Sandy?
Arc Flash hazard
Electrical fires
Electrical burns
Highest Voltage on Production Equipment: UV Cure lamp electrical circuit: 11,500 Volts
Last Electrical Shock incident: That I know of, October

10. ELECTRICAL HAZARDS
Misnomer: Electricity flows through the path of least resistance. (It flows through ALL paths…)
Electric shock occurs when the human body becomes part of the path through which electrical current flows.
The direct result can be electrocution.
Burns can result when a person touches electrical wiring or equipment that is energized
The indirect result can be injury resulting from a fall or movement into machinery because of a shock.

11. Arc Flash/ Arc Blast
Occurs when high amperage current jumps a gap (short circuit) – such as when un-insulated tools are being used on live electrical circuits...
Arc Flash / Arc Blast injuries was the number one source of electrical injuries, and has been for many years…
An arc blast can occur when electrical cabinets/panels are open
Temperatures can be as high as 35,000 F
Metal, Molten metal, or other objects
Pressure Wave

12. ELECTRICAL HAZARDS
Explosions: Occur when electricity provides an ignition source for an explosive mixture in the air.
Flammable vapors
Dust (plastic dusts, grain dust, other organic material, metal dusts,etc)
Fires: Electricity is the most common cause of fires both in the home and in the workplace.
Defective or misused electrical equipment is a major cause.
Electrically Classified Areas and Equipment: Never substitute parts, never make modifications without an Engineering Review!

13. ELECTRIC SHOCK Effects of electric shock depend on:
-- Current & voltage
-- Resistance
-- Path through body
-- Duration of shock

14. CURRENT & VOLTAGE As alternating current increases:
Tingling gives way to muscle contractions
Pain develops
Control of muscles becomes increasingly difficult
At 15 mA, victims cannot let go of the conductive surface
At 70 mA, ventricular fibrillation of the heart occurs (a typical circuit is 15 amps plus)
Death follows in a few minutes
Heavy current flow can also result in severe burns (internal & external) & heart paralysis

15. BY-STANDERS AND APPROACH DISTANCES (AKA Electric Shock Protection Boundaries)
Nominal System Voltage Range, Phase to Phase
Limited Approach Boundary
Restricted Approach Boundary
Prohibited Approach Boundary
Exposed Movable Conductor 
Exposed Fixed Circuit Part 
Less than 50 
36 in
Avoid Contact
50-300 
10 ft 0 in
3 ft 6 in
Avoid contact  
1 ft 0 in
1 in
kV 
5 ft 0 in
2 ft 2 in
7 in
15.1 kV-36 kV 
6 ft 0 in
2 ft 7 in
10 in
36.1 kV-46 kV 
8 ft 0 in
2 ft 9 in
1 ft 5 in

16. General Electrical Concerns
Extension cords can be made ONLY by “Qualified Individuals” (see above…)
Do not use gang plugs (wall mount box on end of extension cord with 2 or more outlets installed…)
Do not use cords with broken ground prongs
Do not piggy-back surge protectors
Do not use zip cords (light weight household type extension cords that do not have a secondary insulation sheath)

17. General Electrical Concerns
Keep all electrical equipment clear from water and moisture
Building Circuit Breakers can be reset ONLY by Qualified Facilities Personnel
The only persons authorized to open and do any work in an electrical cabinet on production equipment are:
Qualified Electro-mechanics
Qualified Engineers

18. Don’t do this at Home....

19. Did I Mention there is a QUIZ???
The quiz is in the following location:
S:\Safety\Training 2008\Dec - Electrical