Photo credits.

Every photograph is a free-licence image from Wikimedia Commons. None shows Spark & Sons’ own work. Fonts are self-hosted under the SIL Open Font Licence.

An open consumer unit with a row of circuit breakers and neatly dressed blue and brown wiringPhoto by Dmitry G, CC BY-SA 3.0. Source page on Wikimedia Commons
A row of grey circuit breakers with printed circuit labels in a modern boardPhoto by Pittigrilli, CC0. Source page on Wikimedia Commons
A 1960s wooden distribution board holding a mix of old fuses and early breakersPhoto by Phiarc, CC BY-SA 4.0. Source page on Wikimedia Commons
Loose wires hanging from an open breaker box on a cream wall beside its removed coverPhoto by Paul The Writer, CC0. Source page on Wikimedia Commons
A red clamp meter reading 220 volts with its test leads plugged into a wall socketPhoto by Benjaminpvera, CC BY-SA 4.0. Source page on Wikimedia Commons
Round white globe pendant lights hanging from a ceiling on long cablesPhoto by Andy Li, CC0. Source page on Wikimedia Commons
A home EV charger mounted on grey siding with its cable coiled on the holderPhoto by Ken Fields, CC BY-SA 2.0. Source page on Wikimedia Commons
Steel cable ladders with orange and green cables fixed to a concrete ceilingPhoto by Leotard, CC0. Source page on Wikimedia Commons
A set of insulation and multifunction testers with test leads on a white backgroundPhoto by Megger Ltd., CC BY 3.0. Source page on Wikimedia Commons
Three light switches hanging out of a wall box on tangled exposed wiringPhoto by Paul Cutler from Chaska, USA, CC BY 2.0. Source page on Wikimedia Commons
A white panel van parked at the kerb on a city streetPhoto by Mj-bird, CC BY-SA 3.0. Source page on Wikimedia Commons
Insulated screwdrivers, pliers and a cable stripper laid out beside an open orange parts casePhoto by Dmitry G, CC BY-SA 3.0. Source page on Wikimedia Commons
Two single-pole miniature circuit breakers standing on a wooden surfacePhoto by Zimin.V.G., CC BY-SA 4.0. Source page on Wikimedia Commons
A DIN rail of breakers with coloured wiring fitted against a blue wallPhoto by Dmitry G, CC BY-SA 3.0. Source page on Wikimedia Commons
Bundles of grey network cable laid in a ceiling cable tray, seen from belowPhoto by ShakataGaNai, CC BY-SA 3.0. Source page on Wikimedia Commons
A wall charger with a green status light mounted beside a window in a garagePhoto by Whoisjohngalt, CC BY-SA 4.0. Source page on Wikimedia Commons
A bare filament bulb under a white enamel pendant shade in front of shelves of bottlesPhoto by Thomas Martinsen (via Unsplash), CC0. Source page on Wikimedia Commons
A green digital multimeter with red and black probes in an open carry casePhoto by Retired electrician, CC0. Source page on Wikimedia Commons
Cable ladders carrying cables along a concrete ceilingPhoto by Leotard, CC0. Source page on Wikimedia Commons
A black wallbox charger with a coiled cable mounted on a grey postPhoto by Matti Blume, CC BY-SA 4.0. Source page on Wikimedia Commons

Photos were cropped, resized and lightly colour-graded. Images under CC BY-SA licences are shared under the same licence as the original.

Archivo and IBM Plex Sans: SIL Open Font Licence 1.1, via Fontsource. The original drawn illustrations are kept in assets/illustrations and are not used.