National Electrical Code Handbook

National Electrical Code Handbook

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The purpose of the additional tube is to protect the wire from contact with the plaster that is likely to accumulate on any horizontal cross timber in a plastered wall. (See Fig. 148.) 3247. In Unfinished Attics and Roof Spaces. Conductors inanbsp;...

Title:National Electrical Code Handbook
Publisher: - 1957


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