. Practical electricity for beginners. Fig. 36. A sim-ple entranceswitch. FUSES AND THEIR PURPOSES 57 Branch Circuita 53. Replacing Fuses.—Great care miist be exercised inreplacing fuses for reasons explained later under Chapter XII, Dangers Involved in the Useof Electricity. The entranceswitch should always be openedif possible when any branch fuseis being replaced, and if the mainfuses blow, you had better havean electrician replace them im-less you have become thoroly fa-miliar with the points describedin the chapter mentioned. Whenever replacing fuses, itis well to use only one hand andto
. Practical electricity for beginners. Fig. 36. A sim-ple entranceswitch. FUSES AND THEIR PURPOSES 57 Branch Circuita 53. Replacing Fuses.—Great care miist be exercised inreplacing fuses for reasons explained later under Chapter XII, Dangers Involved in the Useof Electricity. The entranceswitch should always be openedif possible when any branch fuseis being replaced, and if the mainfuses blow, you had better havean electrician replace them im-less you have become thoroly fa-miliar with the points describedin the chapter mentioned. Whenever replacing fuses, itis well to use only one hand andto keep the other away from. Fuse Blaclta Fig. 37. Showing a very sat-isfactory arrangement of en-trance switch and fuses for usein houses. The switch is en-closed. When the switch is inthe oS position, the branch-circuit fuses can be replacedwithout danger. anything of metal connected to the ground. Summary of Principles in Chapter VII 1. Fuses are safety devices placed in an electric circuit for thepurpose of protection. 2. Fuses have in them a piece of metal known to be able to carryonly a certain amount of current without melting. 3. Fuses are placed in every main circuit in a house and often inmany of the branch circuits. 4. Great care should be exercised in replacing fuses. Questions 1. Why is it important to know what fuses are? 2. What are fuses used for? 3. What might happen if the fuses were omitted in a circuit? 4. Describe the plug fuse. 58 PRACTICAL ELECTRICITY FOR BEGINNERS 5. What happens when a fuse blows? 6. What kind of fuses are commonly used in automobile lightingsystems? 7. Where are the fuse
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