According to OSHA standards, what is required for a proper temporary guardrail system on a flat roof during PV installation?

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Multiple choice — select the best answer

AA guardrail only at access points to the roof
BA single rail at 36 inches high
CWarning tape placed 10 feet from the edge
DA top rail at 42 inches, a mid-rail, and capable of withstanding 200 pounds of force

✓ Correct answer: D. A top rail at 42 inches, a mid-rail, and capable of withstanding 200 pounds of force OSHA standards require temporary guardrail systems to have a top rail at 42 inches, a mid-rail, and be capable of withstanding 200 pounds of force to prevent workers from falling off the roof edge during installation activities.

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