Inadequate control of electricity can give rise to serious dangers due to ire and shock. In the early days of the electricity public supply system the powers involved were small and faults were frequent, often resulting in whole plants being shut down. At least one power station was destroyed by ire when a fault developed and was not cleared. With the vast amounts of power involved today such a situation cannot be allowed to develop and over the years regulations applying to suppliers and consumers have been drawn up to prevent serious situations and accidents as far as is reasonably practicable. A major accident causes the regulations to be reviewed to see how best to prevent a future similar occurrence but it must be said that many of the original regulations were so well and widely cast that remarkably few changes have been required over the years.