Page 74 - Safety Memo

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4. The load line and ball must be inspected at least twice Electrical
each shift. 4941(c)
5. Outriggers are required when using a wrecking ball (truck Each year a large number of employees are injured or killed
cranes). 4941(d) because they come into contact with energized electrical wiring
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
Dust, Fumes, Mists, Vapors, than excavations). 1518
and Gases 1. The employer must:
a. Identify exposed or concealed energized electric
Oxygen deficient atmospheres or harmful dusts, fumes, mists, power circuits if any person, machine, or tool might
vapors, or gases in concentrations sufficient to present a hazard come into contact with the circuit.
to employees must be controlled when possible by removing
the employee from the exposure, limiting daily exposure, or b. Advise employees of the location of energized circuits,
applying engineering controls. 1528 the hazards, and protective measures.
A. Whenever the above controls are not practical or fail to c. Provide legible markings or warning signs to indicate
achieve full compliance, respiratory protection must be used the presence of energized electrical circuits.
according to 5144. 1528(a) 2. Protective equipment or devices must be used to protect
B. Ventilation must comply with Article 4 in the GISOs if it is used employees if a recognized hazard exists.
as an engineering control method. 1528(c) 3. When protective insulating equipment is used, it shall
C. Common sources of the above hazards may include: comply with the Electrical Safety Orders.
1. Engine exhaust emission (carbon monoxide, NOx, 4. Barricades shall be used in lieu of other protective
polycyclic aromatic hydrocarbons, and others). equipment.
2. Blasting (CO2, NOx, asbestos, silica, dust). Note: 1518(d) applies to electrical installations present on
the jobsite which do not involve excavations (for electrical
3. Concrete and rock cutting (asbestos, silica, dust). installations involving excavations as defined in 1540).
4. Fuel storage tanks (harmful vapors). B. General requirements for low-voltage systems (<= 600 V)
5. Lead abatement (lead particles, lead compounds). 1. Only qualified persons may work on electrical equipment
or systems. 2320.1(a)
6. Asbestos abatement (asbestos fibers).
2. Maintenance of electrical installations is required to
7. Demolition (asbestos, silica, lead, dust, etc.).
ensure their safe condition. 2340.1
8. Welding (fumes).
3. Electrical equipment and wiring must be protected from
9. Painting and spraying (solvent, vapors, lead). mechanical damage and environmental deterioration.
2340.26, 2340.11(a)(2), 2340.23
10. Sand blasting (asbestos, silica, lead, dust).
4. Covers or barriers must be installed on boxes, fittings, and
11. Harmful dust, fumes, mists, vapors, and gases from enclosures to prevent accidental contact with live parts.
other sources. 2340.17(a)

36 Cal/OSHA Pocket Guide for the Construction Industry | June 2015 Cal/OSHA Pocket Guide for the Construction Industry | June 2015 37