Services and electrical

21 drawings in Services and electrical, each generated from a single YAML file.

• A house wiring layout from the service entrance to the consumer unit, then breaker by breaker to the sockets and lights in each room
• The four plumbing systems of a house — cold supply, hot supply, drainage and venting — separated out fixture by fixture
• A cooling water P&ID where pumps, heat exchangers, valves and instruments are joined by pipes distinguished by line type
• A substation single-line diagram from the incoming supply through disconnector, breaker and transformer to the low voltage boards
• A town water distribution network from treatment works through service reservoirs and trunk mains to each supply zone, with the ground level of every zone
• An instrument loop from sensing element through transmitter and controller to final element, every device carrying its ISA tag
• The subsystems of a 150kg satellite and how they connect: power, communications, attitude control, data handling and the mission payload
• An LED circuit drawn with IEC and JIS symbols: supply, resistor, LED and switch
• Land-based aquaculture: the water is cleaned, not replaced
• Panel schedule: the table is shaped like the panel
• Ducts are sized by a pressure budget, not by the room
• The circuit diagram taught at primary school: series and parallel
• A transmission line profile: the wire sags, and the towers are sized so it still clears
• A nautical chart carries three datums at once: depths from the lowest water, clearances from the highest, and light heights from the mean — each taken at its worst case
• The counterweight is not there to cancel the weight but to halve the difference: car plus half the rated load, so the motor only ever lifts half the rated load in either direction
• The tread is always horizontal: the staircase appears because the front and rear rollers run on separate rails, and where those two rails come together the steps flatten out at the landing
• The lumens on the box describe the fitting, not the desk: a polar candela plot is the only document that connects them, and at 2.5m a spot that gives 400lx underneath gives 110lx just 1.4m to the side
• A sewage works does not destroy the dirt; it feeds it to microorganisms, settles them out and carts them somewhere else. One line in the drawing runs backwards — the returned sludge, because the microorganisms are the machine, so they are put back rather than thrown away, and only the surplus is drawn off into the sludge line. A combined sewer also spills untreated water in heavy rain.
• At night you see no hull, only coloured lights, so the arcs are cut to make the colours alone fix her heading. Each sidelight covers 112.5 degrees and the sternlight 135 — exactly 360 with no overlap. Green alone means she crosses to your right, red alone to your left, both means head on, and a white sternlight means you are overtaking.
• Japan's two mains frequencies: 50 Hz in the east and 60 Hz in the west, split along prefecture lines and the Fuji River, with a close-up of central Japan showing the four frequency converter stations (Sakuma, Shin-Shinano, Higashi-Shimizu, Hida-Shinano) that link the grids by turning AC into DC and back, 2.1 GW in all and 3 GW planned for FY2027.
• How a Japanese electrician turns a one-line wiring plan into a full wiring diagram. The plan shows only where things sit; the full diagram draws every conductor: white neutral to the lamp and the socket W terminal, black live to the socket and switch, a red switch leg back to the lamp, and each joint marked as a crimp sleeve or a push-in connector, per the national exam rules.