Power and Grounding: Where Does the Hum Come From?

Close-up of the technical power distribution panel on the side of the stage: a metal panel surface divided by function into three independent circuits—lighting, audio, and general outlets—each with its own circuit breaker and label. The audio circuit uses single-point grounding and is completely separated from the lighting dimmer circuit to prevent noise generated by dimmers from entering the audio system. Below the panel are various stage outlets: three-phase power connectors, single-phase outlets, and a row of XLR and network signal interfaces. All lines are labeled with numbers using a label maker. The panel body is made of impact-resistant metal, painted gray. Avoid: all systems sharing the same circuit, no labels or numbering, signal lines and power lines running in parallel, decorative covering for the panel body.

Translated from Chinese by AI.

舞台側面的技術配電盤近景:一面金屬盤面上依功能分成三組獨立迴路——燈光、音響、一般插座,各有獨立的無熔絲開關與標示牌,音響迴路採單點接地並與燈光的調光迴路完全分離,避免調光器產生的雜訊竄入音響系統。盤面下方是各式舞台用的插座:三相電源接頭、單相插座、以及一排 XLR 與網路訊號接口。所有線路以標籤機標示編號。盤體是耐撞的金屬,漆成灰色。避免:各系統共用同一迴路、沒有標示與編號、訊號線與電源線並排走、盤體做裝飾性的包覆。