It is not the case that simply all systems must have SPDs. However, hospitals have a lot of protection and supplies in place. Gary’s note: Where an overvoltage poses a risk to life, they must be fitted. ![]() What the regulations say: Protection against overvoltages shall be provided where the consequences could result in serious injury to, or loss of, human life. SPDs are not the be-all and end-all of safety, but any decision to use them should be based on thorough, fact-based risk assessment. Installations should be functional, useful and always safe. ![]() First and foremost, a designer or installer should consider if protection against transient overvoltage is needed. While BS 7671 now has a much stronger focus on the use of SPDs, it would be wrong to say that some 27 million installations in the UK are suddenly at risk. But does it demand their use on all installations? The 18th Edition of the IET Wiring Regulations (BS 7671:2018), which has been in effect for over a year now, has highlighted some important points to consider regarding SPDs and their use in today’s world.
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