However, most electrical codes now prohibit the routing of electrical conductors through gas piping, due to concerns about damage to electrical insulation from the rough interiors of pipes and fittings commonly used for gas.Ĭomparison with other wiring methods Įlectrical conduit provides very good protection to enclosed conductors from impact, moisture, and chemical vapors. Since this technique provided very good mechanical protection for interior wiring, it was extended to all types of interior wiring and by the early 20th century purpose-built couplings and fittings were manufactured for electrical use. Some early electric lighting installations made use of existing gas pipe serving gas light fixtures which had been converted to electric lamps.
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