Which factor helps in determining the necessity of bonding a metal body to the lightning protection system?

The necessity of bonding a metal body to the lightning protection system is primarily influenced by the presence of a non-grounded metal body. When a metal body is not grounded, it can potentially become energized during a lightning strike. This can create a dangerous situation, both for the structure and any personnel nearby.

When bonding is implemented, it helps to equalize the voltage potential between the lightning protection system and the non-grounded metal body. By establishing a conductive path to ground for the stray currents associated with a lightning strike, bonding reduces the risk of sparking or arcing. This ensures that any surge of electrical energy is safely directed away from the metal body, providing an additional layer of safety.

Factors like the amount of corrosion, the color of the metal, and the height of the structure may affect how well the lightning protection system functions, but they do not directly determine the necessity of bonding. In contrast, the influence of a non-grounded metal body is critical as it directly relates to the risks of voltage differentials and the need to safeguard against electrical hazards.