Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 341
rotected by cut-out and controlled by indicating switches. These 330 PRACTICAL APPLIED ELECTRICITY switches should be double pole except when the device con-trolled does not require more than 660 watts. Heaters mustalways be in plain sight unless special permission be givenby the Inspection…
Electrical engineering
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