True or False: Electrical Fire is often caused by the reasonable care in the maintenance and use of electrical installations and equipment. Select one: True O False
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- Describe and discuss the electrical load requirements for different types of buildings.h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.This is done to ensure that no potential difference can appear between any of exposed metal parts of electrical and non-electrical installations under fault conditions. a. Earthing & Bonding b. Bonding only c. Earthing only d. Either bonding or earthing
- Grounding Lighting Fixtures. There are specific requirements for grounding lighting fixtures. How must they be grounded and with what size conductors? Be sure and cite the code in your answers.7.B. The size of a grounding electrode conductor for a service or separately derived system is generally basedon the size of the largestA. ungrounded supply conductor.B. equipment grounding conductor.C. grounded electrode.D. bonding jumper.7.C. Which of the following statements about bonding is true?A. The joint or termination must offer opposition in the circuit for effective electrical connections.B. Effective bonding keeps impedance high if a fault should occur.C. The entire electrical safety circuit is only as good as its strongest bonded link.D. Bonding connections must endure high levels of fault current until overcurrent protective devices can operate.write down the slection of wiring accessories used in electrical installation
- 5 a) Discuss Electricity power generation and distribution to residential properties. b) with diagrams explain how a Distribution Board is wired to provide electricity to a residential property. c) Explain the following materials and Accessories. i. Male and female bushings. ii male and female adaptors iii. Couplings. iv. Wire/cable sizes and their us1- The recommended limit of voltage drop on a lighting circuit for a single-phase supply as per IEE Wiring regulations is equal to 6.3 volt. Then the value of supply voltage is a. 290V b. 250V c. 210V d. 230V 2- Which of the following statement is TRUE ? a. Resistance is not proportional to length of the material and Resistance is proportional to area b. Resistance is proportional to length of the material and Resistance is proportional to area c. Resistance is not proportional to length of the material and Resistance is inversly proportional to area d. Resistance is proportional to length of the material and Resistance is inversly proportional to areaDetermine the size and type of wire to he installed to a building with temperature that reaches 80-90 degrees with the following loads. 10pcs. Of 200- watt bulb 15pcs. Of 100-watt bulb Single phase, 230 source. And if you would be installing the wire inside an EMT conduit, what size would you use assuming that there would be 4 wires inside the EMT