Summer is finally here! Drive through any neighborhood and it is nearly impossible to miss the signs. The smell of burgers on the grill and fresh cut grass permeates the landscape and perfectly accompanies the sound of children laughing and playing in backyards everywhere. And with summer, comes swimming. Whether it is swimming in a pool, lake, ocean, or even just playing in a puddle, children of all ages jump at the chance to head to water when the temperatures rise.  But before we do, it is important for all of us to take a moment and consider the safety measures that have been put in place to ensure that an epic cannonball off the diving board does not turn into a tragic electrical accident. In case you didn't know, submerging our bodies in water makes us more susceptible to electric shock and reduces resistance of our skin. This in turn permits lower voltage levels to cause a sufficient amount of current to flow through our bodies, which is extremely dangerous, and possibly even deadly. For this reason, NFPA 70®: National Electrical Code® (NEC®) contains many requirements to minimize shock hazards in and around pools and hot tubs and protect us from harm. With this in mind, there are essentially two methods of protection that are employed in the pool and hot tub safety requirements of the NEC®: Eliminate voltage gradients in the water and surrounding areas Interrupt power if and when there is a problem The first method of protection, eliminating voltage gradients, deals less with protection from faulty electrical equipment itself and more so with taking measures to electrically connect conductive surfaces and items in the area around the pool, including measures to bond the water itself to the conductive surfaces and equipment. This concept is referred to as "equipotential bonding," meaning, bonding things together in order to keep everything at the same or equal potential or voltage. The NEC requires all of the following to be bonded together with a minimum of an 8 AWG solid, copper conductor or with rigid metal conduit made of brass or other corrosion resistant material: Conductive pool shells, such as concrete poured or sprayed over rebar or a copper conductor grid Perimeter surfaces up to 3 feet measured horizontally from the inside wall of the pool Metal fittings Electrical equipment associated with the circulation system or pool cover Metallic components Fixed metal parts like ladders and handrails Underwater lighting Lastly, if none of these components to the system are in contact with the actual water itself, means must be provided to expose a minimum of 9 square inches of a corrosion-resistant and conductive material to the water. By connecting all of these items together, the chance that any one of them develops a difference in potential from any of the other items or the water itself is now reduced. The other main method for protecting people from electrical hazards in and around pools and hot tubs involves turning the power off when there is a fault or other problem. There are also two main vehicles in which this level of protection can be provided: An effective ground-fault current path to facilitate the opening of the overcurrent protective device (OCPD) Ground-fault circuit interrupter protection that monitors the current on the circuit and interrupts power when the difference between what goes out and comes back in exceeds 4-6 mA Combined, these two methods protect pool goers by removing the electricity from the environment when there is a problem. For instance, often the area surrounding a pool is very corrosive and harsh with respect to electrical equipment and can cause conductors to loosen up or break off from their terminals. This could lead to a conductor contacting the frame of a motor or a metal raceway or side of a box increasing the chances of someone being electrocuted. Having an effective ground-fault current path like an equipment grounding conductor will help the overcurrent protective device supplying the circuit open quickly by providing a low impedance pathway and spiking the fault current high above the trip setting or rating of the OCPD. For instances where a human might come in contact with this faulty equipment, GFCI protection is required. This protection helps to interrupt the power even when the fault current isn't high enough to trip the OCPD, which might be the case in the event that the EGC or bonding conductor has been broken or otherwise disconnected. All these measures are aimed at protecting us in an environment we often view as recreational and relaxing. However, due to the chemicals and moisture and nature of activities that take place in and around a pool, a certain level of maintenance and care must be done to ensure that these protective measure continue to function and provide the intended level of safety. This is where both qualified electricians and pool owners can work together. Regular testing of GFCI receptacles and circuit breakers is needed to verify that these devices will operate when the need arises. Regular inspection of grounding and bonding conductors is also a must to make sure that these needed pathways are still in place both to open the OCPD when equipment fails and to eliminate dangerous voltage gradients that could lead to electric shock drowning or electrocution. Staying safe in and around pools from electricity is often not the first thought on our minds when the temperature climbs and we head poolside to relax and unwind. But with a little attention to maintenance and inspection of the measures put in place at the time of installation, we can do that cannonball without a second thought.  So now that you're aware of how pools are built to protect you from electricity (even if you don't understand all of the requirements) remember to work together with a local qualified electrical who can help you with maintenance and inspections, and can answer any questions you may have. Then kick back and enjoy your time around the pool this summer knowing you've put safety first!  For additional pool safety tips, resources and information, check out NFPA's website.

May is National Electrical Safety Month and as part of NFPA's mission to help save the world from electrical hazards, we have joined forces with the Electrical Safety Foundation International (ESFi). This year's theme is "Understanding the Code that Keeps Us Safe."  That means sharing information with the world that helps build an understanding of how the National Electrical Code (NEC) became what it is today. Connecting the dots between the problem and the solution can often be difficult when we aren't in the room during the code debate. However, recent requirements around protecting people from electrical hazards in, on, or near bodies of water or pools have been the topic of many recent open discussions and the I have broken out the major points below.  Everybody knows that electricity and water are a bad combination. Many movies have shown how the hero can thwart the evil plans of a world-wide crime syndicate by electrocuting the main bad guy as they stand in a puddle of water, probably sometime after they activated every sprinkler head in the building with a lighter. Or maybe you can relate to getting a cell phone wet, only to find the circuits short out and sensitive electronics burn up inside the phone rendering it useless. I'm sure we can all come up with a million other examples of how water and electricity don't mix. It is a universally-known fact and one that we learned from a very young age. Or did we? The state of electricity today - in and around water How many of us have a pool in our backyard? Or a light at the end of our dock? Or an electrically-powered boat lift? Or maybe you have a boat with a layout that more resembles the comfort of an RV with a 104" flat-screen TV in your stateroom. Many boats today have gone way beyond your grandfather's 14- foot aluminum fishing boat. I could go on about all of the places we ask for electricity without ever thinking about the hazards. But instead, I will start by asking one very important question. What dangers do we face when we put electricity near water? The two major hazards in my mind are, Shock/Electrocution and Electric Shock Drowning (ESD). Let's first talk about what these two things mean. Electrocution and Electric Shock Drowning (ESD) Electrocution is death by electric shock. This usually means that an electricity travels through the body on a path with sufficient current, typically somewhere between 0.1A and 0.5A, across the heart causing it to stop pumping blood. This can happen when an individual comes in contact with an energized thing (i.e. metal ladder, electrical equipment, water) and completes the circuit allowing that current to return to the source. This is the same hazard that exists on dry land as well; if you complete the path, Chances are it is going to be severe. Electric Shock Drowning on the other hand is an entirely different animal. As the name suggests, there is a shock component of this silent killer, but no need to complete a path. What happens in this situation is that an energized component makes contact with the water because the path back to the source is often through the earth and water. This creates voltage gradients within the water and as an individual swims through this area, smaller currents interfere with the body's nervous system and cause temporary paralysis, leading to the individual being unable to stay afloat and eventually drowning. It is sometimes difficult to determine if ESD was to blame since the actual cause of death is drowning and many cases have probably gone undocumented. If it sounds scary, it is. But there is good news. Many intelligent people are coming together to figure out ways to try and protect swimmers in the water, while at the same time support the needs of boat owners (who feel compelled to cut corners and remove safeguards designed to eliminate deaths in the water).  One measure that has proven to be successful in protecting against shock is ground-fault circuit interrupters, or GFCIs. We find these in kitchens, bathrooms, and other areas outside. The basic concept of these devices is that they monitor what goes out and what comes back and when there is a difference (meaning, the current goes somewhere else). Since that "somewhere else" could be a human body, it opens the circuit. One of the issues with GFCIs is that the trip value is set very low, between 4-6mA. This is great for protection against the type of shock that causes electrocution. But when we apply this level of protection to boats, it becomes a problem. Due to the extreme conditions that boats are subjected to, nearly every boat on the water (that utilizes shore power) today has leakage current in this range. As current leaks into the water, it lessens the further from the source it gets. So through all of the research we have found that swimmers won't be subjected to the full amount of current as they would if they were making contact with an energized component.  I used to get calls from irate boat owners who were at their wits end about how to get power to their boats. That dang GFCI just keeps tripping, they'd say! And I know that many of them waited until after the inspection and found a solution outside of what the NEC allows (if you know what I mean), which, in my opinion, is on par with letting your children make toast while taking a bath. However, while nobody would allow a child to take a bath while using a toaster, many people still bragged on social media about how they waited for the inspector to sign off and then pulled out the ground-fault protection. This just blows my mind!    Marina safety Based on these issues, the result of the discussions when it comes to changes in the NEC is one of a happy medium designed to protect swimmers from ESD, and centers around this: 30mA. At this level it is not likely that enough current could pass through a person to cause the temporary paralysis that leads to ESD. However, the conversation didn't end there. For the 2017 NEC it was decided that from an installation stand point it would be best to limit any and all leakage current to 30mA. This included feeders and service level overcurrent devices. The problem is that leakage current on the service is additive, so it doesn't take long to hit that 30mA mark. For instance, a marina with 11 boats that each leak 3mA would cause this protection to jump into action even though 3mA is below the trip value set to protect us in the kitchen and bathroom. To find out how some of the conversation played out, check out my recent In Compliancecolumn in NFPA Journal magazine.  Through all of the well-intended efforts to protect us around new installations, you're probably asking, "But what about my marina that was built in 1984?" And here is where we run into issues. There are many existing marinas and docking facilities where none of these precautions have been taken, so how do we handle those? Well, this is where we need your help. This is where we need to educate people across the country about why it is so dangerous to jump in the water in these areas. Check out NFPA's video below on water safety aimed at informing the public of the dangers surrounding marinas, docks, and boatyards.  So I hope this helps shed some light around these silent killers lurking in the water and I encourage all of us to do our part to foster discussions in our communities about safety in the water. The along with the Electrical Safety Foundation International both have some great resources in battling this deadly issue. You can also find information on NFPA's "electrical safety around water" webpage. Through awareness of this disturbing trend, we aim to educate people on why we need certain safeguards in and around marina and dock installations. Everything points to fixing the problem, not removing the solution, so I leave you with this final question, "Are you ready to stop swimming with toasters in the water?"