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4. What size of copper wire cable (RHW insulation) is needed for the following motor if...
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Po...
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Power factor of the motor. (b) Apparent power input to motor. (c) True power input to motor. (d) Horsepower output of the motor if it is 75% efficient. 4 The follwing s found on the nameplate of a motor. 3 hp 60 Hz 1 phase 120/240 V 34/17 A 1,740 RPM irthe power factor of the motor is 0.30, what...
ance of 500 feet of 1000 kcmil aluminum wire in a steel conduit? 32. At 75°C...
ance of 500 feet of 1000 kcmil aluminum wire in a steel conduit? 32. At 75°C (167°F), what size copper conductors are required (without exceeding NEC recommendations) to feed a /a-horsepower, 115-volt, single-phase motor located 230 ft from the source?
10.17.A split-phase motor has this information on its nameplate: 3/4 hp 1,725 rpm 13.8/6.9 A Full-load...
10.17.A split-phase motor has this information on its nameplate: 3/4 hp 1,725 rpm 13.8/6.9 A Full-load power factor: 0.70 Insulation class B Code U 115/230 V The motor is wired for low-voltage operation. (a) What is the synchronous speed of this motor? (b) What is the maximum locked-rotor cur rent it should draw if wired for 115-V opera- tion? (c) What is the full-load torque (lb ft)?
4.A coaxial cable has an inner core of copper wire with a 3 mm diameter with a current density of...
4.A coaxial cable has an inner core of copper wire with a 3 mm diameter with a current density of 1.768E4 A/m2. The image shows a cross-sectional area of the wire. The current in the core is flowing out of the page. The core is surrounded by a thin sheath of insulating material, 1mm thick. Surrounding this is a thin cylindrical shell of copper wire 1mm thick, that carries the returning current back into the page. The copper shell is...
what information needed? 3. Repeat Example 7.8, using a 100 kVA transformer and #3/0 AWG and...
what information needed?
3. Repeat Example 7.8, using a 100 kVA transformer and #3/0 AWG and #2 AWG cables for the SLs and SDs, respectively Show the procedure to arrive at the following answers (a) 0.72 pu A (b) 0.050 pu V Example 7.8 residential secondary distribution system. Assume that the distribution trans- Figure 7.11 shows former capacity is 75 kVA (use Table 7.1), all secondaries and services are single-phase three wire, nominally 120/240 V, and all SLs are of...
1-4.5 A company manufactures small electric motors having horse power ratings of 0.1, 0.5, or 1.0...
1-4.5 A company manufactures small electric motors having horse power ratings of 0.1, 0.5, or 1.0 horsepower and designed for operation with 120 V single-phase ac, 240 V single-phase ac, or 240 V three-phase ac·The motor types can be distinguished only PROBLEMS by their nameplates. A distributor has on hand 3000 motors in the quantities shown in the table below Horsepower 20 Vc 240 V ac 240 V 30 900 200 100 400 500 200 100 600 0.5 One motor...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the above transformer to serve a branch circuit panelboard. The panelboard will be located 10' from the transformer. The primary side raceway is PVC and the secondary raceway is EMT. All calculations will conform to applicable NEC regulations. The primary side, overcurrent protection device, will be chosen based on the next available standard size of the full load amps of the transformer. The secondary side,...
1. The color of the outer finish of the insulation or tape marking a grounded conductor...
1. The color of the outer finish of the insulation or tape marking a grounded conductor must be A. black B. green. C. white or gray D. yellow finish. 2. When the main bonding jumper in a residential el ectrical system is a screw only, the screw must be identified with a A. white B. red C. green D. black The grounding electrode conductor should be installed without a splice, unless the splice is made using exothermic welding or by...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm a...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm and length of the frame is 1260 mm. If the motor is running at full-load, calculate: a. the total losses and efficiency. b, the approximate shunt field exciting current if the shunt field causes 15% of the total losses. the value of...
pleas help me in this do any question you know using National Electrical Code 2011 Applied Electricity NEC...
pleas help me in this do any question you know using National
Electrical Code 2011
Applied Electricity NEC worksheet t hree Copper conductors with THHN insulation run in Electrical A branch-circuit Consther conductors. The conductor terminations are rated for a maximum ure in the area of this installation is not expected to exceed 30C size 8 AWG, the maximum ampacity of the conductors If the conductors for this circuit are permitted A 40 amperes. B. 50 amperes. to be used...
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Power factor of the motor. (b) Apparent power input to motor. (c) True power input to motor. (d) Horsepower output of the motor if it is 75% efficient. 4 The follwing s found on the nameplate of a motor. 3 hp 60 Hz 1 phase 120/240 V 34/17 A 1,740 RPM irthe power factor of the motor is 0.30, what...
ance of 500 feet of 1000 kcmil aluminum wire in a steel conduit? 32. At 75°C (167°F), what size copper conductors are required (without exceeding NEC recommendations) to feed a /a-horsepower, 115-volt, single-phase motor located 230 ft from the source?
10.17.A split-phase motor has this information on its nameplate: 3/4 hp 1,725 rpm 13.8/6.9 A Full-load power factor: 0.70 Insulation class B Code U 115/230 V The motor is wired for low-voltage operation. (a) What is the synchronous speed of this motor? (b) What is the maximum locked-rotor cur rent it should draw if wired for 115-V opera- tion? (c) What is the full-load torque (lb ft)?
4.A coaxial cable has an inner core of copper wire with a 3 mm diameter with a current density of 1.768E4 A/m2. The image shows a cross-sectional area of the wire. The current in the core is flowing out of the page. The core is surrounded by a thin sheath of insulating material, 1mm thick. Surrounding this is a thin cylindrical shell of copper wire 1mm thick, that carries the returning current back into the page. The copper shell is...
what information needed?
3. Repeat Example 7.8, using a 100 kVA transformer and #3/0 AWG and #2 AWG cables for the SLs and SDs, respectively Show the procedure to arrive at the following answers (a) 0.72 pu A (b) 0.050 pu V Example 7.8 residential secondary distribution system. Assume that the distribution trans- Figure 7.11 shows former capacity is 75 kVA (use Table 7.1), all secondaries and services are single-phase three wire, nominally 120/240 V, and all SLs are of...
1-4.5 A company manufactures small electric motors having horse power ratings of 0.1, 0.5, or 1.0 horsepower and designed for operation with 120 V single-phase ac, 240 V single-phase ac, or 240 V three-phase ac·The motor types can be distinguished only PROBLEMS by their nameplates. A distributor has on hand 3000 motors in the quantities shown in the table below Horsepower 20 Vc 240 V ac 240 V 30 900 200 100 400 500 200 100 600 0.5 One motor...
1. The color of the outer finish of the insulation or tape marking a grounded conductor must be A. black B. green. C. white or gray D. yellow finish. 2. When the main bonding jumper in a residential el ectrical system is a screw only, the screw must be identified with a A. white B. red C. green D. black The grounding electrode conductor should be installed without a splice, unless the splice is made using exothermic welding or by...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm and length of the frame is 1260 mm. If the motor is running at full-load, calculate: a. the total losses and efficiency. b, the approximate shunt field exciting current if the shunt field causes 15% of the total losses. the value of...
pleas help me in this do any question you know using National
Electrical Code 2011
Applied Electricity NEC worksheet t hree Copper conductors with THHN insulation run in Electrical A branch-circuit Consther conductors. The conductor terminations are rated for a maximum ure in the area of this installation is not expected to exceed 30C size 8 AWG, the maximum ampacity of the conductors If the conductors for this circuit are permitted A 40 amperes. B. 50 amperes. to be used...
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