In most cases the need for lightning protection is obvious when any of the following apply:
Large crowds
Service continuity
High flash frequency
Tall isolated buildings
Structures that contain explosives or flammable materials
Structures that house irreplaceable heritage materials/exhibits

Risk assessment is a guide that takes into account the effects of lightning on the following factors:
Building exposure
Type of construction
Building occupancy
Building contents
Lightning stroke consequences

Consequences of lightning strikes:
Private homes   Fire, electrical, plumbing and electronic equipment damage
Farms   Fire/sparks, power failure to livestock buildings, and step voltage consequence
Public buildings   Risk of fire & panic, power failures including alarm systems, loss of life
Businesses/hospitals   Risk of fire & panic, power failures including alarm & electronic equipment, egress problems, handicap egress issues, loss of life
Industrial buildings   Production loss, loss of electronic/computer equipment

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