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Material Type: Project; Professor: Underwood; Class: Appropriate Technology (W); Subject: Interdiscplinary-Sci,Tech,Wrld; University: Messiah College; Term: Unknown 1989;
Typology: Study Guides, Projects, Research
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Exploring Electrical Technology (IDST 300) Names:_______________________ Messiah College _______________________ Dr. Harold Underwood Group Bag#: ______ Project #1: An Electric Lamp Objectives: 1. Assemble a simple working lamp socket and plug to become more familiar with a common household electrical device.
____7. Pull the wire through the plug housing as shown in Figure 4 so the underwriters knot is seated snugly at the bottom, but does not pass through the hole. ____8. Twist each exposed end of bare wire so the wire strands are tightly packed (as in Figures 3 and 4). It is important for safety to twist all of the fine strands into a tightly packed bundle. ____9. Use pliers from your toolbox to bend a small hook in the wire (see Figure 4). Using pliers rather than your fingers may be preferred, if the pliers can make a neater hook. ____10. Loosen the screws on the prongs of the plug. Continue turning them out until they stop, but do not force them beyond this point. ____11. Wrap the wire hook around the screw, so the hook points in the clockwise direction. This way, tightening the screw will also tighten the hooked bundle of wire. With a screw driver, tighten the screw and secure the wire. See also Figures 5 and 6 for further illustration. ____12. Make sure no loose strands stick out from underneath the screw. If you see loose strands, remove the wire, twist the strands together again, and reconnect. ____13. Attach the second wire to the other prong, as above. B. Wiring and Assembling the Lamp Socket ____1. Locate the lamp socket. Open the socket by squeezing and pulling on the upper part in the area marked APress.@ Identify the socket parts as illustrated in Figure 7. ____2. Separate about 2 1/2 inches of cord on the free end and put it through the center tube and base as shown in Figure 8. ____3. Tie the underwriters knot, as before. Refer to Figure 9 and/or Figure 2. ____4. Strip off from 1/2 to 3/4 inch of insulation at the free end of each wire. Twist strands of each wire into a tight bundle, as before. Use pliers to form a half-loop (hook) in each wire. ____5. Loosen the terminal screws on the lamp socket, but do not force them all the way out. ____6. Wrap one wire around each terminal screw in the clockwise direction and then tighten screws. ____7. Again, make sure no loose strands are visible. If loose strands exist, remove wire, twist strands together, and reconnect. C. Checking : Before final assembly, have your instructor check your plug and lamp socket, and initial below. Plug checked: ________ Lamp socket checked: _________
Technology (IDST 300) at Messiah College, by Dr. Harold Underwood.