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KESV101-102 > Electrical Installation > Flashcards

Electrical Installation Flashcards

1
Q

Generation

A
  • Electromagnetic Induction
  • Ohm and Other laws
  • AC/DC generators
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2
Q

Transmission

A
  • Transporting voltage from a power station to the point of consumption
  • High voltages used over longer transimission lines to avoid loss of energy (P)
  • Transformers at the end of the line

6.6kV: 11kV: 22kV: 66kV: 132kV: 275kV: 400kV: 800kV

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3
Q

Distribution

A
  • Brick built/ Mini substations
  • Transformers at end of line steup-down the electricity for town standard reticulation systems [380/220V 3 phase 4 wire]
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4
Q

Domestic Distribution

A
  • Single phase for domestic, supplied by nearest substation [P.V.C.A.S Underground]

8kVA-16kVA: 35A-70A: All at 230V

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5
Q

Supply and Meter Box

A
  • Used by local authorities to moniter use of electricity by a consumer and charge them accordingly
  • Contains main circuit breaker, earth, conduit for the user distribution board, conduit for imcoming main
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6
Q

Distribution/Sub-Distribution Board

A
  1. Neutral bar
  2. Circuit breakers
  3. Main circuit breaker (m.c.b)
  4. Earth leakage
  5. Earth leakage switch
  6. Conduit from meter box
  7. Conduits to lighting + sockets
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7
Q

Main Switch Disconnector/Isolator

A
  • Double pole isolator (live and neutral)
  • Mounted adjacent to the appliance it controls
  • Switches installed to isolate/control the supply to sockets
  • Isolates the appliances/entitre sdb from the mian supply when triggered
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8
Q

Earth Leakage Unit

A
  • Earth all items of quipment
  • Goal is to minimise the potential difference between the live wires and the earth
  • The current flows thru eath wire because it is the path of least resistance
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9
Q

Circuit Breaker & Fuse

A
  • Circuit breaker trips automatically when the current goes over the rating for an extended period of time
  • Fuse melts when exposed to an overcurrent for an extended period of time, breaking the circuit

Both protect the systems from overcurrent

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10
Q

Wire Connection Variations

A
  • Delta Connection
  • 3 Star Connection
  • 4 Star Connection
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11
Q

Single phase AC

A
  • One alternating volatage between two conductors
  • Standard of 50Hz
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12
Q

3 phase AC

A
  • Is actually 4 pahse but the 4th phase connector/wire is neutral
  • This Star Point is then earthed
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13
Q

Production of Alternating Current

A
  • Water/Steam turbine
  • Deisel for smaller ones
  • Alternate energy sources available
  • 50Hz standard
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14
Q

Production of Direct Current

A
  • Non-Oscillating voltage
  • Related to batteries and other stored energy sources
  • Cannot be stepped up or down with a transformer
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15
Q

Design principles of domestic electrical installation

A
  1. Safe
  2. Economical
  3. Easy to maintain
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16
Q

Other aespects to consider when designing a domestic electrial system

A
  • Volt drop [5%]
  • Current Rating [I²R]
  • Protection from overcurrent
  • Earthing system

Linked to Authority’s earth cable,
Earth Rod,
Earth Mat [Copper,2m Deep]

17
Q

Lighting Installation

A
  1. Cost
  2. Illumination Level and Lighting Type
  3. Origin

Usualy Radial type circuit; can be ring circuit

Code of Practice for the Wiring of Premises

18
Q

Lighting Specifics

A
  • Circuit breaker of 10Amps
  • 1.5mm pvc insulated copper, in 20mm conduit
  • New circuit for every 100m² of lighting
19
Q

Sockets

A
  • ** Living Area** – 3 sockets 150mm above f.f.l
  • Bedrooms – Between beds and at diagonal corners of room
  • Kitchen – 1 socket every 1.2m 150mm above worktops
  • Bathroom – Supplied by double wound transformer only or not at all
  • Stove – 10mm² insulated copper, 6mm² bare earth, 25mm pvc conduit
  • Boilers – 2.5mm² insulated, 2.5mm² bare earth, 20mm pvc conduit
20
Q

Main Wiring Systems

A
  1. Conduit
  2. PVC Sheathed Cables
  3. Mineral Insulated Sheathed Cables

Protect Conductor, Earth Cont: Bellow Plaster Finish: Surface Mounting

21
Q

Cables

A
  1. Solid core vs Stranded core
  2. Armour
  3. Different materials for insulation
22
Q

Calculating Estimated Load

A

[SUPP]

22
Q

Electrical Installation Schedules

A
  • Architecht and electrical contractor
  • Does not require consulting engineer
  • Certificate of installation once contractor is complete

SABS Code of Practice for the Wiring of Premises: SABS Code of Practice for Building Drawings Practice

KESV101-102 (11 decks)

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