by Brad Banz
As firefighters, we respond to a wide variety of scenarios involving electrical hazards. Immediately, downed lines calls come to mind to most responders because of the obvious hazards they pose. In this article, I would like to discuss other types of incidents in which electrical hazards could be encountered and address our response as first responders.
Since I started the conversation by bringing up the topic of downed electrical lines, what should you do if you encounter such a situation? As in many other emergency situations, your job is to secure the area and keep people out. Electrical lines can carry many thousands of volts of electricity, with cross-country transmission lines carrying up to 345,000 volts. What does that mean to you? That means that you don't have to be in contact with the line for an electrical path to be established. Electricity from energized high voltage lines can jump several meters to things such as ladders if they are establishing a path to ground. The area around an energized downed line can also form a ground gradient, an area which is energized, and which will still be a shocking hazard. That's why it's important to secure the area in between poles and keep all ladders a minimum of 3 meters away from energized lines. Treat all lines as energized. Also have the contact number available for your local electrical utility so they can be notified of the situation. If electrical lines are downed across vehicles, have the passengers jump to become free from the vehicle if they can do so. If they cannot, then make them stay in the vehicle until the electrical lines have been shut off by the electrical utility.
Structure fires are another common instance when electricity can be an issue. While electrical service may not always be involved in the fire, regardless of cause, it's a good idea to secure electrical power to ensure that it doesn't become a hazard. Electrical power can usually be secured by turning it off at a circuit breaker if safe to do so. If electrical service is a major issue, the electrical utility must be notified so they can secure power outside the structure. The utility company should also be notified in areas such as informal settlements where illegal wiring arrangements are involved. The illegal wiring can be dangerous, especially with the iron sheet construction of many of these homes. Finally, one last consideration is hidden fire. If you have an electrical fire, or suspected electrical in wiring, open the wall up.
Many machines, especially in industrial settings, use lots of electrical power. Many times, an electrical fire or smoldering electrical fire can be controlled by simply securing electrical power to the machine. Even if the machine has any fire involvement at all not involving the electrical systems, it's still good to secure power. If power cannot be secured, a powder extinguisher suitable for electrical fires should be used. One set of machines in which powder should not be used on are computers or other types of electronics. Many computer centers have their own halon extinguishing systems. CO2 extinguishers are the preferred agent for use on computers and electronics.
While there are other electrical issues that you as a first responder may run across during your career, I tried to come up with the ones that you would be most likely to come across. I hope that everyone has gained something from this article. As always, stay safe out there.
Brad Banz has been involved in the fire
service for 40 years, serving with the Colwich
Fire Department as a volunteer from age 20,
including a 10 year term as Chief. Brad Banz
has served with AFM on several mission trips.