UNDERWATER ELECTRICAL SAFETY

Code No: 921

Video Running Time: 18 minutes

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The aim of this film is to establish that using electric power whilst totally immersed in sea water can be safe. It is supplied complete with support documentation designed to assist in the use of the film as a teaching aid.

It deals diagrammatically with some basic electrical theory to demonstrate that the current that will flow through water depends on the voltage gradient in the water and also that there are well-defined limits of shock current and shock time that can be withstood by a diver. It stresses that divers must be protected from shocks by both passive means - such as good earthing of the electrical equipment - and active means - such as residual current circuit breakers. These techniques are gone into in detail.

The importance of safe working practices whilst welding under water is underlined and a brief consideration is given of R.O.V.s and impressed current anodes.