Electricity does its worst work where you cannot see it. The burn on the skin is not the injury. It is the door the injury walked through.
When current passes through a body it turns into heat, and the heat gathers where the tissue resists it. But the body’s best conductors, its blood and muscle and nerve, run deep, and they carry the current along their length like wire. So the current takes an internal path, cooking muscle and nerve from the inside, while the skin at the entry and exit points may show only a small and deceptively tidy burn. The people who treat electrical injury repeat a rule because juries and even doctors forget it: the size of the skin burn does not tell you the size of the injury. A neat mark on the palm can sit over a forearm of dead muscle.
The kind of current matters. The alternating current in the lines and the walls does something direct current does not. At the frequency we use it, it locks muscle into a sustained contraction. The hand that closes on a live conductor cannot open, because the muscles that would release the grip are the same muscles the current is clamping shut. There is a threshold, low and specific, above which a person loses the ability to let go, and above it the victim is held to the source, taking current for as long as the circuit stays closed. Direct current tends to throw a person clear. Alternating current holds them on.
And the current does not have to burn much to kill. If it crosses the chest it can catch the heart in the vulnerable sliver of its cycle and throw it into fibrillation, the muscle quivering in place instead of pumping. Ordinary low-voltage household and commercial current kills this way. Very high voltage and lightning tend instead to stop the heart outright, in the hope it restarts on its own. Either way the danger is not always immediate. The rhythm can read normal at the scene and go wrong hours later, which is why a person who took a real shock is watched on a monitor even after they say they feel fine. The heart keeps its own counsel.
There is a second way electricity injures, and it never touches the body with current at all. When a fault jumps the air between conductors it forms an arc, and the arc is a small sun. The air inside it can reach roughly nineteen thousand degrees Celsius, several times the temperature of the surface of the sun. It throws a wave of radiant heat that ignites clothing and chars skin in a fraction of a second, a pressure blast that can knock a worker off a pole or a ladder, a spray of molten metal, and a sound loud enough to take hearing. A worker does not have to touch anything to be catastrophically burned by an arc flash. Being close enough is the whole of it.
This is the world the people who build and maintain the grid work inside every day, and there is a body of law written precisely because of it. The federal standard for electric power generation, transmission, and distribution work, OSHA’s 29 CFR 1910.269, does not treat a live line as an ordinary hazard. It requires that the worker on the job be a qualified employee, trained to recognize energized parts and judge their voltage. It sets minimum approach distances keyed to voltage that a worker may not cross unless the line is insulated, covered, or de-energized. And it lays an affirmative duty on the host, the utility that owns the installation, to tell the contractor’s crew what they are working near: the characteristics of the system and the hazards the crew cannot see for themselves. The rules exist because the hazard is invisible right up until it is not.
For an injured line worker or plant electrician, the law of the injury is often not the law of the workplace they expect. Workers’ compensation may bar a suit against the direct employer, but it does not touch the others whose choices put the worker in front of the hazard: the utility that failed to de-energize or to warn, the general contractor that controlled the site, another crew that re-energized a line believed dead, the maker of equipment that should have interrupted the fault. The compensation bar is a wall around one defendant, not around the accident. The question in these cases is almost never whether the worker was hurt. It is who else, standing safely on the ground, decided the line was safe.
So when the injury is electrical, distrust the surface. The small burn on the hand is a caption, not the story. Look for the path the current ran inside the arm, the rhythm the heart may still be hiding, the arc that never had to make contact. And then ask the question the compensation form does not: who else, standing on the ground, called the line dead.
On the mechanism of electrical injury, the heat generated along the body’s low-resistance internal path, the “let-go” threshold of alternating current, and arc temperatures near nineteen thousand degrees Celsius, see M.R. Zemaitis, M. Guirguis & R. Cindass, Electrical Injuries, StatPearls (2026). On the heart, low-voltage alternating current inducing ventricular fibrillation while high voltage and lightning tend toward asystole, and the case for delayed cardiac monitoring, see V. Waldmann et al., Electrical Cardiac Injuries: Current Concepts and Management, European Heart Journal (2018). On the duties owed in power-line work, see OSHA, 29 CFR 1910.269 (electric power generation, transmission, and distribution). This is general information, not medical or legal advice.
