International Library of Technology · Scranton, International Textbook Co. · leaf 295
Fig. 1. Fig 2. of the circuit. Knife switches should be substantially con-structed and should have a contact surface at the clips ofat least 1 square inch for every 80 to 100 amperes. Theblades should be made of good conducting material, prefer-ably of drawn copper, and the clips should be stiff… … Fig. 3. than if pure copper blades were used. For pure copper,the blades should have a cross-sectional area of about1 square inch for every 1,000 amperes carried. Fig. 2 showsa front-connected switchprovided with fuses f, f,and Fig. 3 shows a triple-pole switch as mountedon a switchboard…
Electrical engineering
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