Michigan Master Electrician PREP TEST Q&A | VERIFIED

Michigan Master Electrician PREP TEST Q&A | VERIFIED 3 phase voltage drop - ANSWER 1.73 x K x I x L/A (K = resistance per foot, I = Current, L = length) Efficiency 3 phase - ANSWER HP(746)/1.73IE(pf) When equipment grounding is accomplished by means of an equipment ground, the size is determined from - ANSWER Table 250.122 Parallel conductors in nonmetallic raceway, grounding is determined by - ANSWER Table 250.122(F) When supplying power from a grounded system from one building to another on the same property, it's required by _____________ to run a separate equipment grounding conductor in addition to an insulated neutral - ANSWER 250.32(B) Code for Motor Branch Circuit - ANSWER 430 Motor Branch Circuit conductor size code - ANSWER 430.22 The ampacity of a #2 TW copper conductor is about _______% greater than a #6 TW copper conductor - ANSWER 170% (316.16) A permitted substitution for cable type FPL is - ANSWER CMP, CMR, CM (t760.154d) The primary of a transformer has 120 windings. The secondary has 24. This is a _____________ transformer. - ANSWER 5 to 1 A panelboard equipped with snap switches rated at 30 amps or less shall have ____________ of 2000 amperes or less - ANSWER overcurrent protection (408.36A) What size overloads are correct for a 5HP 230V motor with a nameplate FLC of 22 amps and a service factor of 1.2? - ANSWER 27.5 amps What is the minimum allowed fusible disconnect for a three phase 480v 15HP motor? - ANSWER 25 (t430.52) Kilowatts - ANSWER E x I x 1.73 x PF/1000 KVA - ANSWER E x I x 1.73/1000 HP (output) - ANSWER E x I x (EFF) x PF x 1.73/746 Amps when HP is known - ANSWER HP746/E x EFF x PF x 1.73 Amps when kilowatts are known - ANSWER KW(1000)/E x PF x 1.73 Bends in broadband network cable shall not _______________ - ANSWER damage the cable (830.160) Can four #3 THW Cu conductors be added in a 2" RMC with five #4 RH conductors - ANSWER Yes (Ch 9 T4 T5) Underground conduit entering a building must be _____________ - ANSWER Sealed GFCI protection shall be provided for outlets not exceeding 240 volts that supply boat hoist installed in dwelling unit locations - ANSWER 210.8 (c) Loads for additions to existing installations (dwelling) - ANSWER 220.16 (A) PVC expansion table - ANSWER Table 352.44 Equipment bonding jumper to 200 amp sub panel fed with 4/0 - ANSWER Table 250.122 #6 copper and #4 aluminum Grounding electrode conductor to building steel for 1200 amp service - ANSWER Table 250.66 Separation of conductors class 2 from 120 volt - ANSWER 725.136 Furnace own branch circuit - ANSWER 422.12 How much larger shall the general lighting load be for a residential service calculation if an additional nine general purpose receptacle outlets are added to a home under construction? - ANSWER No additional calculations are required. They are included in the square footage calcs in 220.12. (220.14 (J)) What chapter of the NEC will you find requirements for electric cranes and hoists? - ANSWER Chapter 6 (610 Cranes and Hoists) Where a tap is made in a wireway that amounts to 12 square inches including conductors, the minimum square dimension allowed is: - ANSWER 4 x 4 (376.22) A luminare shall be installed so that combustible material is not subject to temperatures in excess of _______ degrees C - ANSWER 90 (410.11) What is the minimum depth for a 4 inch by 4 inch junction box which contains 10 #14 AWG looped conductors? - ANSWER 1 1/4" (Table 314.16 (A))