|
|
Electrical Hazards
 Because
they may be built in proximity to overhead power lines, and because they are often made of metal, scaffolds can put
workers at risk of electrocution. This risk can be removed through proper clearance and maintenance. Note:
Except where indicated, these requirements also apply to manually propelled, pump jack, ladder jack, tube and coupler,
and pole scaffolds, as well as the specialty scaffolds described in the
Supported Scaffolds module.
| << Overhead
Power Lines |
- Scaffolds must not be close enough to overhead power lines that they, or any conductive materials (e.g. building
materials, paint roller extensions, scaffold components) that may be handled on them, come closer
than 10 feet to the power line (Figures 2 and 3).
- Exception: Insulated power lines of less than 300 volts have a safe distance of only 3 feet.
TIP: Because it may be difficult to determine if a power line is
insulated, or what its exact voltage is, the 10 foot rule should always be applied.
- Scaffolds may be closer to overhead power lines than specified above if such proximity is
necessary for the type of work being done, and if the power company or electrical system
operator has been notified and has either:
- De-energized the lines (Figure 1);
- Relocated the lines;
- Installed protective coverings to prevent accidental contact with the lines. [1926.451(f)(6)]
Figure 1. Example of powerlines that have been grounded. |
 |
 |
| Figures 2 and 3. Example of scaffold being built dangerously close
to power lines. |
|
Additional images |
|
| << Portable
Electric Tools |
- Because metal frame scaffolds are conductive, power tools, cords, etc., that suffer insulation failure can electrify
the entire scaffold. This poses a risk of electrocution not just to the worker holding the tool, but to everyone who
contacts the scaffold. Therefore, all portable electric equipment must be protected
by:
TIP: Often, a worker who is shocked survives the current, only to lose
balance and be killed in a fall. This is one more reason for always using fall protection.
|
|
Back to Top 
www.osha.gov