In a plumbing drawing, blue and red lines are used to represent two separate pipe networks. According to standard drafting conventions, what do these colours indicate?

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Computer · Plumbing Drawings

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Red represents hot water supply, while blue represents cold water distribution.

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Answer 1

Red marks main supply lines, while blue marks vent or relief connections.

Answer 2

Red denotes wastewater lines, while blue indicates hot water supply lines.

Answer 3

Red represents hot water supply, while blue represents cold water distribution.

Answer 4

Red shows electrical conduit routes, while blue shows sanitary plumbing lines.

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