A mobile crane is operating within 20 feet of overhead power lines rated at 35kV. What additional safety measure is required beyond maintaining clearance?
Correct Answer
D) Dedicated spotter and insulated link or boom guard
When operating near high voltage lines, OSHA requires additional protective measures including a dedicated spotter and either an insulated link or boom guard device. These provide redundant protection against accidental contact.
Why This Is the Correct Answer
OSHA 29 CFR 1926.1408 specifically requires that when cranes operate within 20 feet of energized power lines, additional protective measures must be implemented beyond just maintaining clearance distances. For lines over 350V, this includes having a dedicated spotter to watch for potential contact and either an insulated link or boom guard device installed on the crane. These redundant safety systems provide multiple layers of protection against electrocution hazards. The combination of human oversight and physical protective devices is mandatory, not optional.
Why the Other Options Are Wrong
Option B: Use of non-conductive taglines only
While utility notification may be required in some situations, it is not sufficient as the sole additional safety measure. OSHA mandates specific physical and procedural protections (spotter and insulated devices) that must be in place during the actual crane operation.
Option C: Grounding of the crane to earth
Grounding the crane to earth is actually counterproductive and dangerous when working near power lines. If the crane contacts an energized line, grounding would create a path for electrical current to flow through the crane and potentially electrocute operators or ground personnel.
Memory Technique
Use the acronym 'SIB' - Spotter + Insulated device + Boom guard. When cranes get close to high voltage, you need both human eyes (Spotter) and protective equipment (Insulated link or Boom guard) working together.
Reference Hint
OSHA 29 CFR 1926 Subpart CC - Cranes and Derricks in Construction, specifically section 1926.1408 on power line safety
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