Chapter 1: Safety Flashcards
Requires employers to provide their employees with working conditions that are free of known dangers
Occupational safety and health act
Safety standard of practice for tree care
Anzi z133
KE=(weight/×2) x speed
Kinetic energy equation
Self checking STAR
Stop
Think
Act
Review
Principles of accident prevention. Close calls at the bottom to a fatality at the top
Accident pyramid
Unsafe acts and close calls at the bottom of the pyramid
Leading indicators
Serious injury and fatality
Lagging indicators
Theory that workplace injuries to be caused by a number of contributing factors and causes which randomly interact.
Multiple causation theory
System approach to safety. Recognize human error and errors have to be considered in the context of the system that it occurred
High reliability organization
Voltage difference when a person near a ground fault with 2 body parts straddles that voltage differential.
Step potential
Voltage differential btw 2 objects someone simultaneously contacts.
Touch potential
Electrical flow in an unintended direction through a transformer
Back feed
____ ____organization is a group that takes a
systematic approach to safety, recognizing that humans are imperfect & that errors have to be considered in the context of the system in which they occurred.
High reliability
Advantages of providing temporary accommodations for a
large-scale disaster response:
Oversight
Economies of scale
Communication
An excellent example of electrical safety standards is:
Ansi Z133 American National Standard for Arboricultural
Operations - Safety Requirements
British Standards Institute Recommendations for Tree Work
BS3998
Two types of failure modes
mechanical & electrical
Used to formally review site conditions and job procedures and determine whether it can be done safely
Job briefing
Surface temp at the point of contact with high voltage can reach
1000 c 1832 f
Contract arrangement in which the contractor is responsible for all financing, and owns the work until the project is complete and turned into the owner
Turn key contract
Rule suggest that workers should take time before starting a job to check for potentially unsafe conditions and confer about them
2 minute rule
Unsafe acts include
Unsafe condition include
Human error, willful rule violation, maliciousness
Equipment failure
