National Examination Council, NABTEB GCE Electrical Installation and Maintenance Works Questions and Answers for 2019 NABTEB GCE Examination is now available, subscribe now and get the questions and already solved answers by Examrelief.
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👑 2019 NABTEB GCE ELECTRICAL INSTALLATION ANSWERS👑
100% VERIFIED ELECTRICAL INSTALLATION OBJ ANSWERS
100% VERIFIED ELECTRICAL INSTALLATION THEORY ANSWERS
Conductor:A conductor is a material which electricity, heat or sound can flow through. An electrical conductor conducts electricity. The ability to conduct electricity is called electrical conductivity.
Examples: Iron and copper
(ii)Insulator :An electrical insulator is a material whose internal electric charges do not flow freely; very little electric current will flow through it under the influence of an electric field. This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily.
Examples: plastics and rubber.
(choose Any Two)
(i)Flux allows solder to properly form between the pad and the component.
(ii)It extends the life of the solder particles.
(iii)It generates the correct viscosity and adhesion.
(iv)It cleans the surface of pad and components.
(v)It cleans oxide in the solder particles.
(vi)Protect surfaces during soldering.
(Choose Any Two)
(i)Western Union splice: connects two conductors together and is particularly useful in repairing a broken wire. The two wires are trimmed of insulation, then each is wrapped around the other around six times.
(ii)Tap splice: A tap splice connects a loose wire to the conductor at an angle, typically resembling a “T” shape. They are named tap splices because the loose wire can then “tap” the flow of the conductor. The wires of the loose wire are wrapped around the conductor, first with one on one side and then with five or more on the other.
(iii)Fixture splice: A fixture splice connects two different conductors and can be called a rat tail splice. The two exposed wires must be twisted together with a plier, then bent into place.
Earth Lead: The conductive strip or wire that connects an electrical installation or appliance to the earth electrode is called Earth Lead. Earth lead can be of copper, galvanized iron etc.
Earth Electrode: A conductor buried in earth for the purpose of electrical earthing is known as earth electrode. The shape of the earth electrode may vary from conductive rod, conductive plate, metal water pipe or any other conductor with low resistance. Earth electrodes are made of copper, galvanised iron, cast iron etc.
Earth Continuity Conductors: They are the conductors used for connecting the earth lead to various electrical appliances and devices such as distribution boards, electrical sockets, appliances etc. It may be in the form of flexible wire, cable metallic covering or metallic pipe.
Consumers earthing:consumers earthing terminal is typically connected to the metallic sheath or armour of the distributor’s service cable into the premises.Consumer has no any permission to mix Neutral with earth at his premises here earthing and grounding is the different by practice.
(i)Protective conductors are to be separate for each circuit. Selection of sizes is to be in accordance with Table 54F of IEE Regulations.
(ii)Protective conductors are not to be formed by conduit, trunking, ducting or the like.
(iii)Conductors buried in the ground shall normally be laid at a depth of 1000 mm below the underground power cables in an excavated trench
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