What precautions must be utilized and maintained when setting up or using a Delata 4 wire system that is to serve both 240 V and 120 V single phase loads?
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A: Let's consider a balance 3 phase circuit as shown below.
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What precautions must be utilized and maintained when setting up or using a Delata 4 wire system that is to serve both 240 V and 120 V single phase loads?
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- Why is it important that the hot conductor in a 3-wire branch circuit be properly connected to opposite phases in a panelboard? __________________Is it permissible to use standard 60C insulated conductors to connect all counter-mounted cooking units? ___________________________________________________ Why? ________________________________________________________________a. Must the metal frame of an electric clothes dryer be grounded? ___________ b. Is it permitted to ground the metal frame of an electric clothes dryer to the neutral conductor? ___________
- What is the rated ampacity per phase for six No. 3/0 THHN copper current-carrying conductors with two conductors per phase ( parallel) and all conductors installed in the same conduit? a. 280 b. 315 c. 320 d. 360 Please show work/code references to go with if possible!5. How many system bonding jumpers normally are there for a separately derived system that's grounded? A. ThreeB. TwoC. One D. Zero 6. How many grounded neutral conductors are in a 208Y/120 volt, 3-phase, 4-wire system? A. ThreeB. TwoC. One D. Four 7. Which of the following are sometimes installed as an emergency system, legally required standby system, or optional standby power system for a building or structure? A. GeneratorsB. Surge protection devices C. Surge arrestersD. Transformers 8. If the system bonding jumper in a DC system is a screw, what color must the screw be? A. WhiteB. RedC. Orange D. Green 9. If overcurrent protection is provided in the transformer of a separately derived system, which of the following statements is correct? A. An equipment grounding conductor must be run with the conductors between the transformer and the building's disconnect. B. There's no need for service equipment or a panelboard in the separate building.C. A ground electrode must…How can you calculate the maximum short-circuit current that can pass when the A-B ends of an outlet in your home are short-circuited? What kind of measurements can be made for these calculations?
- What is the recommended maximum kVA rating of a single motor-driven piece of equipment on a 100- kVA, 120/240-V, single-phase, three-wire system?Four No. 12 and four No. 10 conductors are to be installed in a EMT conduit 600 V jacketed. What size EMT conduit is required if a. The conductors are Type T90 Nylon? b. The conductors are Type RW90?What are the minimum allowable ampacities of the phase conductors and the neutral conductor that are to supply a 2-phase, 3-wire, 230-volt, 30-horsepower motor
- How can you calculate the maximum short-circuit current that can pass when the A-B ends of an outlet in your home are short-circuited? What kind of measurements can be made for these calculations? Please explain.a. Does the circuit for the Master Bedroom have a grounded circuit conductor? ____________________ b. Does it have an equipment grounding conductor? ____________________ c. Explain the difference between a grounded conductor and an equipment grounding conductor. ____________________ ____________________6.A. How many grounded neutral conductors are in a 208Y/120 volt, 3-phase, 4-wire system?A. ThreeB. TwoC. FourD. One 6.B. A separate building that's supplied with a feeder or branch service will also need aA. separate EGC from the supply EGC.B. transformer for isolation.C. neutral conductor bonded to ground.D. grounding electrode system.