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hot bus bar /ˈhɒt ˈbʌs ˈbɑː/ n

中文：火线母线

中文 · 火线母线Español · regleta colectora térmicaFrançais · barre collectrice
Meaning：Conductive part of the panel into which the breakers for each circuit are plugged.
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Found in these illustrated scenes（1）

Circuit breaker panel

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