Media work does not look dangerous next to a welding shop, which is exactly why people get hurt doing it. A small shoot can combine a few thousand watts of lighting on one wall circuit, steel stands holding hot fixtures above people's heads, cables across a doorway, a bag of lithium batteries, a box of snap-off blades and a can of spray adhesive — and then move it all onto a sidewalk beside traffic. Almost every injury on a set is predictable, and most are prevented by a quick calculation or a habit that takes seconds.
Electrical load and extension cords
Every light draws power, and power is voltage times current. A typical Ontario wall outlet is on a 120 V circuit protected by a 15 A breaker, so the most that circuit can deliver is 1800 W — and for loads that run for hours, like lights, the usual practice is to stay at or below 80% of the rating, about 1440 W. The trap is that several outlets in a room, and sometimes in the next room, are often on the same circuit. Three 650 W tungsten lights plugged into three different outlets can still add up to 1950 W on one breaker, which trips it — or, with a faulty breaker or a damaged cord, overheats the wiring instead.
- Map the circuits first. Find which outlets share a breaker — switch one off at the panel, or plug a small light into each outlet and see which go dark — and spread heavy lights across different circuits.
- Use cords rated for the load. Thicker cords carry more current; with the AWG system, a lower number means a thicker wire. A thin household cord feeding a 1000 W light gets hot.
- Uncoil cords fully when they carry a heavy load. A coiled cord cannot shed heat, and it can get hot enough to melt its own insulation.
- Never daisy-chain power bars or extension cords; each connection adds resistance and heat, and the total load is hidden.
- Outdoors or near water, use outdoor-rated cords and a GFCI (ground fault circuit interrupter), which cuts power in a fraction of a second if current leaks to ground through a person.
- Tape cables down with gaffer tape or run them under cable ramps across any walkway, and inspect cords for cuts and crushed sections before plugging in.
Hot lights, stands, sandbags and ladders
- Tungsten lights burn instantly. The housing and barn doors of a 650 W fixture get hot enough to burn skin within minutes of switching on. Wear leather gloves to adjust them, and let them cool before packing.
- Never touch a quartz bulb with bare fingers. Skin oil creates a hot spot on the glass that can make the bulb fail or shatter. LED panels run much cooler, but their heat sinks and power supplies still get hot.
- Keep lights away from anything flammable — curtains, paper backdrops, gels left on too long — and never cover a light to dim it.
- Sandbag every stand. Hang the bag on a leg, low down, so it adds weight at the base. On a C-stand, put the tallest leg under the load, so the weight sits over the leg rather than past it.
- Raise the thickest section of a stand first and keep the thinnest for last; lights rigged overhead need a safety cable as a second support.
- Ladders: use the 4-to-1 rule for an extension ladder (one unit out from the wall for every four up), keep three points of contact, never stand on the top two rungs of a stepladder, and have someone hold the base.
Batteries, blades and chemicals
- Know a battery's energy. Watt-hours equal voltage times amp-hours. Airlines generally allow spare lithium batteries up to 100 Wh in carry-on only, with batteries between 100 and 160 Wh needing airline approval — never in checked bags.
- Retire a swollen, hot or smelly battery immediately. Swelling is a sign of internal failure. Move it to a non-flammable surface, away from anything that can burn, and take it to a battery recycling point.
- Charge on a hard, non-flammable surface with the correct charger, and do not leave large packs charging unattended overnight.
- Utility knives: cut away from your body on a cutting mat with a metal straightedge, retract the blade every time you put the knife down, and snap dull segments into a closed blade container.
- WHMIS (the Workplace Hazardous Materials Information System) applies to spray adhesives, paints, solvents and cleaners. Read the supplier label and its pictograms, check the Safety Data Sheet (SDS) for handling and first aid, and use them only with ventilation.
- Hot glue guns cause deep, sticky burns; set them on their stands and keep a bowl of cool water nearby.
Thermal runaway cannot be put out like an ordinary fire
A damaged or overcharged lithium-ion cell can heat itself, vent flammable gas and set off the cells next to it, a chain reaction called thermal runaway. It can burn fiercely and reignite after it looks finished. Prevention — undamaged batteries, correct chargers, no charging on beds or sofas — is far more effective than any response once it starts. If a battery begins to smoke, get away and call for help.
Location, traffic and hearing
- Get permission. Filming on city property often needs a permit from the municipality's film office, and private property needs the owner's permission — both also cover who is responsible if something goes wrong.
- Never stand in the roadway for a shot. Use a spotter for any operator looking through a viewfinder near traffic, wear high-visibility vests, and keep tripods and cables off the path pedestrians use.
- Plan for weather: sun, heat and cold injure crews, and rain makes cables and lights dangerous. Lightning means stop.
- Drones are regulated by Transport Canada. Drones from 250 g to 25 kg must be registered, and the pilot needs a drone pilot certificate.
- Protect your hearing. Ontario's workplace noise limit is 85 dBA averaged over 8 hours. Every 3 dB above that halves the safe time: 88 dBA for 4 hours, 91 for 2, 94 for 1. Turn headphone volume down before plugging in, and wear hearing protection at concerts and loud events you are filming.
You have the right to refuse unsafe work
Ontario's Occupational Health and Safety Act gives workers the right to know about hazards, the right to take part in health and safety decisions, and the right to refuse work they believe is dangerous. On a student set the same principle applies: anyone can call a stop when something looks unsafe, and the professional response is to stop and fix it, not to argue.