• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 4 · Society, Civilization, Culture
• 41 · material aspects of daily life
• 41A · housing
• 41A3 · parts (of house or building)

41A39 · piping and wiring

• 41A391 · water-supply and draining, pipework (in house or building)
• 41A393 · electric installation, fittings, e.g. socket, plug, light switch, cable, wire