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2 Guardrail Systems Guardrail systems are made up of vertical rails, top rails, mid rails, and toe boards. 4. They are designed to keep workers from getting too close to the leading edge of a roof. They must be 42 in. ) above the walking/working level and must be able to withstand a sideways force of at least 200 lb. as applied 2 in. from its top edge. Additionally, it must be able to withstand a downward force of 150 lb. or in any other direction. Intermediate vertical members, between posts, must be no more than 19 in.

9 Moving and Carrying Heavy Objects Generally speaking, workers moving heavy objects should use specialized equipment such as dollies, hand trucks, wheelbarrows, and carts. ). When lifting a heavy object, a worker should bend his or her knees, keep his or her back upright, and lift the object straight up from directly in front of or between the feet. 10 Roofs and Attics Roofs can be 15°C hotter than ambient temperature due to heating from sunlight. The roof then reradiates in the infrared, adding to the direct solar radiation experienced by a worker.

More germane to the topic of extreme weather is the fact that some of the best sites for photovoltaic (PV) systems in the United States are in the Mojave Desert and neighboring “high desert” areas. 6 kWh/m2/day. The average high temperature for Barstow, California in July is 41°C (105°F), while average daytime low temperature is 3°C (37°F). /h) during summer afternoons. To prepare for temperature extremes, low humidity, and occasional high winds is a significant safety challenge. The first step in addressing this challenge is to employ appropriate clothing for the climate and time of year.

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