Transcript File lesson 1_1--general safety

GENERAL SAFETY
Electrical Injuries
Electrocution
• Current kills - voltage forces the current to
flow more readily.
• 1mA – 5mA of current is safe to handle.
• 15mA or higher is enough to cause
physical damage.
Electrical Injuries
Burns
•
Electrical resistance produces heat. The
more current, the more severe the burn.
•
Touching shorted components will burn
you.
Electrical Injuries
Exposure to Unsafe Materials
•
PCB’s - Polychlorinated biphenyls
• Florescent lights, old transformers and old capacitors
•
Smoke from burning or melting components
•
Battery Chemicals
•
Printed Circuit Board Etching Materials
•
Older, lead-based solder
Electrical Injuries
Exposure to Unsafe Materials
Material Safety Data Sheet Example
• Used to tell exact safety, handling,
disposal, first aid, etc. for materials.
• Always be cautious and check the MSDS
sheets for products you are using.
Electrical Injuries
Puncture Wounds
• Small wires can easily puncture the skin.
• Pulling out (ICs) Integrated Circuits
incorrectly can cut or puncture the skin.
General Safety Rules
1.
Follow all written procedures.
2.
Read service manuals, material safety data
sheets or other documents that discuss
specific safety precautions related to the
equipment you are working with.
3.
Do not disable safety lockouts, grounding
prongs, or other devices designed to
prevent injury.
General Safety Rules
4.
Avoid damp and wet areas when working
with electricity.
5.
Avoid wearing jewelry or baggy clothing.
6.
Assume circuits are on and check with
instruments before handling wires.
7.
Broken or damaged tools should be labeled:
DAMAGED DO NOT USE and the instructor
should be notified so that the tool may be
repaired or replaced.
General Safety Rules
8.
9.
Have a trusted helper control the power so
that passersby do not turn the power back
on.
Use only the appropriate class of fire
extinguisher to put out electrical fires. Only
Class C fire extinguishers will put out
electrical fires. Water will only make
electrical fires worse.
10. Use chemicals as directed on the container.
General Safety Rules
11. Do not use any tools or equipment until
instructed on their proper use.
12. Use safety glasses whenever around
chemicals that may splash or objects that
can be thrown.
13. Take your time. Most accidents occur when
people rush their work.
14. Keep the laboratory clean and neat. Clutter
and broken or dirty tools can create a safety
hazard.