Question

2- The Electrical System Unit 14 14.5 Premises Ground-Fault Current Path 14.8 Conductor Power Los Metal parts of premises wiring must be bonded to a low medance path designed so that the circuit protection device will quickly open and clear a ground fault 12 Conductor poner losses are directly proporional tl le lengh of the conaco and the areofthe cnrt duce the line- aused by the current is doubled, the power loss will be increased by a) True -percent al 100 向200 C) 300 (d) 400 Because of the earth's high resistance to current flow,it cannot be used for the purpose of clearing a line-to-case ground fault forwiring. a) utility b) premises c) a or b d) none of these g. 14.9 Reducing Voltage Drop and Power Loss 13. The most effective way to reduce conductor voltage drop and power loss is to lower the current flowing through the bonded power conductors. This is accomplished by the transmis- sion vollage 14.6 Utility High-oge Transmission Lines a) reducing 10. Electrical power is generated and transmitted across long increasing ldy none of these transmission lines to the customer. These conductors have a very low resistance, but because of their length, the con cuctor losses can be significant. actor 。 14.10 Generating Plants al voltage drop bi power e to perm 14. The electrical system usually begins at the generating plant that converts energy to three-phase power current Id) a and b (a) 13. 20 kV Ib) 13.80 kV (c) 69 KV 14.7 Conductor Voltage Drop ld) 138 ㎸ The voltage drop over a conductor is directy proportional to the of the conductor a) area (o) circular mils c) length d) none of these ecifies that www.MiketHolt.com 88. NEC.CODE (632.2633 183 Mike Holt Enterprises, Inc.