Match the following trade terms with their definitions.

1. The amount of thermal energy impressed on a surface at a certain distance from the source of an electrical arc. Incident energy is typically expressed in calories per square centimeter (cal/cm²).
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2. An approach limit at a distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists.
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3. The maximum incident energy resistance demonstrated by a material (or a layered system of materials) prior to material breakdown, or at the onset of a second-degree skin burn. Expressed in joules/cm² or calories/cm².
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4. An approach limit at a distance from exposed energized electrical conductors or circuit parts within which a person could receive a second-degree burn if an electrical arc flash were to occur.
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5. One who has demonstrated the skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to identify and avoid the hazards involved.
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6. An additional electrode (commonly a driven rod or pipe) required where the primary electrode is an underground metal water pipe in direct contact with the earth.
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