If 22 - #6 AWG type THHN Copper conductors are placed in a single Electrical Metallic...
If 22 - #6 AWG type THHN Copper conductors are placed in a single Electrical Metallic Tubing, EMT, conduit, the ampacity must be de-rated by what percent for this number of conductors?
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If 22 - #6 AWG type THHN Copper conductors are placed in a
single Electrical Metallic...
How many #4/0 AWG type XHHW conductors will fit into a Trade Size 3 ½ Electrical Metallic Tubing,...
How many #4/0 AWG type XHHW conductors will fit into a Trade Size 3 ½ Electrical Metallic Tubing, EMT, conduit?
Ten #3 AWG copper load carrying conductors with type THHW, 75oC insulation are installed in a...
Ten #3 AWG copper load carrying conductors with type THHW, 75oC insulation are installed in a rigid metal conduit, RMC. What is the final loaded allowable ampacity for each conductor?
Question 2 Six (6) THHN conductors rated at 75 deg. C. are installed within one metallic...
Question 2 Six (6) THHN conductors rated at 75 deg. C. are installed within one metallic raceway at a distance of 350 feet. Each conductor must carry 60 amps. The operating voltage is 208 volts, single phase and 90% power factor. In order to maintain a 1.0% voltage drop, using THHN cable what size conductors are required? What is the size of the metallic raceway?
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...
O AWG copper conductor without any markings to indicate the The terminal for dh s terminal is assumed to have a min...
O AWG copper conductor without any markings to indicate the The terminal for dh s terminal is assumed to have a minimum terminal temperature rating E. 90°C. 60°C. of: C, D. 75 C. B. 40-С. Code reference re rated branch-circuit supplies fluorescent luminaires (lighting fixtures) with a peres. All terminations are 75°C rated, there are only three current- THHW as shown in Figure 1.43 pe 10. A 20-am carrying conductors in EMT, and the conductor insulation is The minimum size...
D. trade size 1 1/2 (41). Atrade size 4 (21). B.trade size 1 (27). (53). Ctrade size 1 1/4(35). E. trade size 2 Cod...
D. trade size 1 1/2 (41). Atrade size 4 (21). B.trade size 1 (27). (53). Ctrade size 1 1/4(35). E. trade size 2 Code reference 29. The general use 125-volt receptacles in a commercial building are supplied by 20- ampere rated multiwire branch-circuits with three ungrounded conductors anda common neutral from a 208/120-volt, 4-wire, 3-phase electrical system. The con ductors for nine circuits are run in a single raceway to an area of the building includ ing nine ungrounded conductors...
1. Transformer with three legs A, B and C in case of homogenous the first leg...
1. Transformer with three legs A, B and C in case of homogenous
the first leg A has coil with 3 Henry, what is the Henry at leg
C
a. 0.5 H
b. 1 H
c. 2 H
d. 2.5 H
2. If a carrier wave of 10MHz is amplitude modulated by an audio
signal of 1 kHz, the resultant signal to be broadcast contains only
the:
(A) 10,001,000-Hz component
(B) 10,001,000-Hz and 9,999,000-Hz components
(C) 10,001,000-Hz, 10,000,000-Hz, and 9,999,000-Hz...
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. 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...
The amount of available fault current at the service depends upon the ______. Method of banding...
The amount of available fault current at the service depends upon the ______. Method of banding Method of grounding Size and impendence of the service transformer Ampere rating of the overcurrent protection device The line current for a 240/120 volt, 3-phrase system, if each phase is balanced with a 3,000-VA load and the total load is 9,000 VA, is ______ amperes. 12.5 15 21.65 37.5 Given: A dwelling unit has 3,000 sq.ft. of habitable space with laundry facilities and bathrooms,...
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...
O AWG copper conductor without any markings to indicate the The terminal for dh s terminal is assumed to have a minimum terminal temperature rating E. 90°C. 60°C. of: C, D. 75 C. B. 40-С. Code reference re rated branch-circuit supplies fluorescent luminaires (lighting fixtures) with a peres. All terminations are 75°C rated, there are only three current- THHW as shown in Figure 1.43 pe 10. A 20-am carrying conductors in EMT, and the conductor insulation is The minimum size...
D. trade size 1 1/2 (41). Atrade size 4 (21). B.trade size 1 (27). (53). Ctrade size 1 1/4(35). E. trade size 2 Code reference 29. The general use 125-volt receptacles in a commercial building are supplied by 20- ampere rated multiwire branch-circuits with three ungrounded conductors anda common neutral from a 208/120-volt, 4-wire, 3-phase electrical system. The con ductors for nine circuits are run in a single raceway to an area of the building includ ing nine ungrounded conductors...
1. Transformer with three legs A, B and C in case of homogenous
the first leg A has coil with 3 Henry, what is the Henry at leg
C
a. 0.5 H
b. 1 H
c. 2 H
d. 2.5 H
2. If a carrier wave of 10MHz is amplitude modulated by an audio
signal of 1 kHz, the resultant signal to be broadcast contains only
the:
(A) 10,001,000-Hz component
(B) 10,001,000-Hz and 9,999,000-Hz components
(C) 10,001,000-Hz, 10,000,000-Hz, and 9,999,000-Hz...
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. 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...
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