Dr Andrew Murrison

On 6 April last year, my constituent Jason Knight was cleaning the last window of the home of a regular customer in Westbury when he was electrocuted by 33,000 V from an overhead cable. He was blown 7 feet across the garden, waking up on a patch of scorched grass with catastrophic injuries. Found by his customer, he was airlifted to hospital in Bristol in 12 minutes and placed in a coma. He woke up surrounded by his distraught family. He was very lucky to survive. Jason was left with life-changing injuries. He has lost his left arm below the elbow, several toes, and a great deal of leg musculature. He has undergone over 20 sets of surgical intervention, suffered severe burns all over his body, and can walk or stand only with the utmost difficulty. Now he is losing his sight as a delayed effect of the electrocution. He is just 34 years old with three small children. He had started his own business that was growing and he was providing for his young family. He is a real doer, but his injuries are such that it is going to be extremely difficult for him to work again. What happened was this: 33,000 V leapt, without physical contact, about 2 metres from an overhead power cable to Jason’s telescopic water-fed cleaning pole. The Health and Safety Executive made inquiries, of course, but concluded there was no breach of regulations that warranted investigation. Indeed, an HSE spokesperson told the BBC that the overhead powerlines involved in this incident met national safety standards. In the UK, we tolerate high tension power cables that are slung surprisingly close to commercial and residential buildings. However, it was not the overhead powerlines that failed Jason; it was the cleaning pole. As Jason said to his father, John, shortly before he was taken to theatre to have his forearm amputated, “I don’t understand, Dad—I bought an insulated pole.” It should not have mattered that he was close to a power line, because the pole should have been fully insulated, but it was not. Jason was using a telescopic pole that could extend and retract. The handle section at the bottom was insulated, but the extended section was not. He was electrocuted when he reached up to retract the extended section. I have to say that before Jason came to see me, I knew very little about window cleaning. As he and John recounted the story, I assumed that it was the water from the water-fed pole that was the culprit, since tap water, being impure, conducts electricity perfectly well. Jason and his dad put me right: window cleaners, including Jason that day, use pure water, or what is often called “zero water.” This kind of water has been filtered to remove all or nearly all dissolved solids, so that it leaves no watermarks on windows after cleaning. Ordinary tap water does not have that property. At that moment, I realised why my own attempts at window cleaning at home invariably left the glass looking worse. The crucial point is this: pure water is non-conductive, so the water in Jason’s pole was not the culprit. What caused this accident was inadequate insulation in a tool designed to be used at height, even in proximity to overhead power lines. This is not a new, unforeseeable risk. The first water-fed poles, developed in the United States in the 1950s, were made entirely of aluminium. When window cleaners started to be electrocuted, the manufacturers simply slapped on some warning labels. At that time, the greatest hazard to window cleaners in Britain was falling off ladders, but when pole technology crossed the pond in the 1990s, its safety issues came with it. One British manufacturer, Craig Mawlam, head of Ionic Systems in Swindon—whose expertise I have drawn on extensively—recognised that danger early. He sought out non-conductive materials, developing composite glass-fibre and carbon-fibre poles. He prioritised insulation in the handle, and worked with the Health and Safety Executive to introduce training and guidance as the industry moved away from ladders and towards working from terra firma. Critically, however, this was voluntary, not required. There was, and remains, no mandatory British standard governing the electrical insulation of telescopic cleaning poles.