78) Why is solder in old lighting fixtures harder to remove than new solder? 79) What is Alternating Direct Current? 121) At what percentage does voltage drop become un-acceptable? 122) When using a generator, how many ohms resistance can the grounding rod have? 123) What are the two types of feeder cable authorized for stage use? 124) According to the NEC 1999, what is the maximum allowable length of SJ cable for stage use? 125) How many amps is 12ga. THHN wire rated for? 126) How many amps is 14ga SJ cable rated for? 127) How many watts is 12ga. SO cable rated for? 128) What is the difference between a NEMA 5-15 and L5-15 Plug? 133) What is the difference between SJOW and SJOOW cable? 135) Why would 12/3 SO cable be rated for more in amperage than 12/19 SO wire? 136) What is the specified torque on a Camloc set screw? 142) What is the minimum size wire which should be attached to an NEMA L21-30 plug? 145) What is “Poor Mans 220?” 146) Why shouldn’t Gaffers tape be used over electrical connections on stage? (2 reasons) 150) Why aren’t twofers without molded junctions approved of by the NEC? 151) What is the proper name for Greenfield or BX cable? 152) What does the NEC say about attaching a 25' or longer Edison cable directly to a service panel - why? 156) 2/0 SC Cable is rated for how many Amps? 163) Which lamp base is bigger: candelabra, Intermediate, or mini candelabra? 177) What does cmils have to do with wire?. 178) What two colors are the neutral wire allowed to be according to the NEC? 179) On European cable wired for 120v. what color is the neutral supposed to be? 180) On Zip Cord or SPT-2, what determines which wire is the neutral? 184) The grey wire on an electronic component is what? 185) 18' is the minimum NEC height of a service drop over a sidewalk, private driveway, or street? 186) What happens inside a standard circuit breaker when it trips? 187) How do you tie a UL knot? 194) In a 1900 type box, If the frame of a standard receptacle/outlet is grounded, why does the NEC say you should still run a ground wire to the conduit box? 197) Why won’t a GFCI protect against shorts, or overloads? 198) When the neutral conductor touches a grounded surface such as a metal outlet box on the load side of a GFCI, the GFCI will do what? 199) What two applications can you not use a GFCI receptacle for? 200) What is the difference between a 3-way and 4-way switch? 201) What does the break-off tab on a receptacle do? 203) On a switched circuit feeding through the lampholder, there are three wires, the Black, White and Red, which two wires would be correct to use to feed the lampholder? 205) The wires connected to the “A” and “B” terminals on a 3-way switch are called what? What color are they? 209) Are you allowed to ground to sewer pipes? Why? What about water inlet pipes and regulations for them? 216) Name three ways you can reduce grounding rod resistance in the soil. 217) What is the difference between grounded, bonded and grounding conductors? 219) What is the difference between time delay and dual element fuses? 221) How do you “Float the Ground?” 222) Do you count the neutral wire when determining the capacity of multi-cable or raceways? 225) What is the current recommended practice for which side is up on a receptacle and why? 226) When mounted horizontally, which side of a receptacle should be mounted up? 227) Under what conditions can you use a ground-lift adaptor? 228) What is a DPDT Switch? 235) Why are household dimmers in a cord fed quad box frowned upon by the code? 238) How many Edison cube taps can you stack? 243) Would a GFCI preform properly if fed by a 12/2 SPT-2 (Zip Cord)? Why or why not? 255) How many volts does analog run off of? 256) Which pin on a 3-pin XLR plug is the positive? 259) Rubber such as the jacket of wire has bad chemical resistance to two things, which are they? Acids, Alcohol, Caustic Bases, Gasoline, Grease, Kerosene, Oil, Solvents, or Water? 260) Which of the following has only fair chemical resistance to grease and water? (The rest have good) Nylon, Melamine, Phonolic, Urea, Ployvinyl Chloride, Polycarbonate, or Rubber 261) Which material has the best continuous temperature rating, Nylon, Urea, Phenolic, or Ployvinyl Chloride? 262) An electric motor is over-heating and it is not from the load, what is probably the cause? 263) What problems might a switch or dimmer mounted on the neutral leg of a lamp cause? 280) If the show lights suddenly dim, and it is not from the power company because it is only your lights, what is this an indication of and what will probably happen next? 281) What is the minimum amount of twists on a pigtail splice for a good connection? 283) Acid fluxes are more useful than rosin flux for tinning large wire. True or False? Why? 288) Of the two Strain Relief Inserts in a Bates plug with a flat and rounded side to each, describe the quantity and position of them when using 14/3 SJ wire, 14/3 SO, 12/3 SJ, 12/3 SO, and 16 ga heat wire in a fiberglass sleeve. 289) Why would the use of vinyl tubing be frowned upon by the NEC when used on a 16 ga power cord over a SJT jacket, into a plug? 299) What is the difference between MTW, THHN, and TW wire? 300) On a Slip Panel mount receptacle mounted vertically, does it matter which end is up, and if so, which end should it be? 301) On a twist Panel mount, such as a L6-15R, our 208v. connector, does it matter which end is up, and if so which part should it be? 302) If the Diversitronics strobe is 3,000 watts, why is it permissible to use a L6-15 plug on it?