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Electrical Equipment of Buildings

Nature volume 150, page 119 (25 July 1942) | Download Citation



THE Institution of Electrical Engineers has just issued recommended War Emergency Relaxations of the Regulations for the Electrical Equipment of Buildings (llth Edition), copies of which are available from the Institution free of charge, except where a number of copies is required. Regulation No. 304 relating to voltage-drop is amended, and the current ratings of certain cables are increased. The current-rating tables affected are Nos. 5 to 9 inclusive and 16. Two new tables, 5(A) for small single-core cables of earthed concentric wiring, and 10(A) for mineral insulated cables of 0-007 sq. in. cross-sectional area and above, are now added. Table 10(A) takes the place of Tables 10, 11 and 12 referred to in clause 302(B) for the cables in question. The purpose of the relaxations is to economize in materials.

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