Page 241 - Safety Memo

connection. 4941(b)
4. The load line and ball must be inspected at least twice Electrical
each shift. 4941(c) Each year a large number of employees are injured or killed
5. Outriggers are required when using a truck crane to because they come into contact with energized electrical wiring
swing a wrecking ball. 4941(d) or equipment. The Electrical Safety Orders (ESOs) are designed
Note: See crane standards in the Cranes section of this to control or to eliminate these often-deadly exposures and
guide; Group 13 in the GISOs. include:
A. General requirements for protection from electric shock (other
than excavations). 1518
Dust, Fumes, Mists, Vapors, 1. The employer must:
and Gases a. Identify exposed or concealed energized electric
power circuits if any person, machine, or tool might come
Oxygen-deficient atmospheres or harmful dusts, fumes, mists, into contact with the circuit.
vapors, or gases in concentrations sufficient to present a hazard
to employees must be controlled when possible by removing the b. Advise employees of the location of energized circuits, the
employee from the exposure, limiting daily exposure, or applying hazards, and protective measures.
engineering controls. 1528 c. Provide legible markings or warning signs to indicate the
A. Whenever the above controls are not practical or fail to presence of energized electrical circuits.
achieve full compliance, respiratory protection must be used 2. Protective equipment or devices must be used to protect
in accordance with 5144. 1528(a) employees if a recognized hazard exists.
B. Ventilation must comply with Article 4 in the GISOs if it is used 3. When protective insulating equipment is used, it shall comply
as an engineering control method. 1528(c) with the Electrical Safety Orders.
C. Common sources of the above hazards may include: 4. Barricades shall be used in lieu of other protective equipment.
1. Engine exhaust emission (carbon monoxide, NOx, Note: 1518(d) applies to electrical installations present on
polycyclic aromatic hydrocarbons, and others). job sites do not involve excavations (as defined in 1540).
2. Blasting (CO2, NOx, asbestos, silica, dust). B. General requirements for low-voltage systems (<= 600 V)
3. Concrete and rock cutting (asbestos, silica, dust). 1. Only qualified persons may work on electrical equipment
4. Fuel storage tanks (harmful vapors). or systems. 2320.1(a)
5. Lead abatement (lead particles, lead compounds). 2. Maintenance of electrical installations is required to
ensure their safe condition. 2340.1, 2340.2
6. Asbestos abatement (asbestos fibers).
3. Electrical equipment and wiring must be protected from
7. Demolition (asbestos, silica, lead, dust, etc.). mechanical damage and environmental deterioration.
2340.26, 2340.11(a)(2), 2340.12(a)
8. Welding (fumes).
4. Boxes, fittings, and enclosures must be guarded by covers or
9. Painting and spraying (solvent, vapors, lead). barriers to prevent accidental contact with live parts, or
10. Sandblasting (asbestos, silica, lead, dust). guarded by location if accessible only by qualified persons.
2340.17(a)
11. Harmful dust, fumes, mists, vapors, and gases from
other sources. a. Except for fuse replacement and other necessary access
by qualified persons, maintain guarding of energized parts
within a compartment during operation and maintenance
functions to prevent accidental contact with energized
parts and dropped tools. 2340.17(d)

40 Cal/OSHA Pocket Guide for the Construction Industry June 2019 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 41