MEP201 Mechanical Engineering Drawing 1st semester 2005-06

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MEP201 Mechanical Engineering Drawing1st
semester 2005-06

• S R Kale
• Lecture
• Wiring Drawings

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Wiring - Applications

• Power to equipment (grid, back-up) -
• motors, generators, arc welding, furnace,
  lathe, A/C,
• Connecting computers or DAS -
• Power to computers, instruments,
• Product wiring (industrial/consumer) ?P-control
• IC engine, CNC lathe, Robot, Injection molding
  m/c, Aircraft (300 km), Automobile, Washing
  machine,
• Illumination
• Domestic, Laboratory, Factory, Office,
• Plant
• Power plant, refinery, food processing, paper
  mill,
• Safety - fire

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Wiring drawings

• Input information
• Schematic, PI drawings
• Equipment G.A. drawings
• Layout drawings
• Logic for interlocks
• Wiring outputs
• Wiring schematic/diagram
• Wiring/Cable routing (to scale, with BoM)
• Teams of
• Electrical, I C, civil, engineers

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Types of wiring

• Power supply and transmission
• I C signal
• Telephone
• Data cables

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Wiring - Construction

• Conductor
• Copper and Cu -alloys
• Aluminum
• Optic fiber
• Sheath (insulation, protection, mechanical
  strength)
• Plastic, PVC
• Armored
• Fabric
• Diameter, single-multi core, strand, bend-radius

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Wiring ? Piping

• Similar methodology
• ? Schematic ? Line diagram
• ? Use G.A. of equipment layouts
• ? Prepare routing drawing - 3-D or plan-elevation
• ? Provide supports and joints
• ? Get Bill of Materials

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Types of wiring diagrams

• Wiring schematic (One-line diagram)
• Power connections
• Control system diagram
• Interlock wiring / Sequence control wiring
• Data bus

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Power

• Power Supply - available at one location.
• Power Demand supply to each equipment.
• A.C.
• No. of phases 1 or 3
• Voltage 240, 415 V 3.3, 11, 25, 220, 400, 600
  kV
• Frequency 50 or 60 Hz. 400 Hz
• D.C.
• 3, 5, 6, 9, 12, 14, 24 V (cars, computers, TFT,
  instruments)
• 1500 V, 500 kV (HVDC)

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Wiring Elements

• Wires / Cables
• Devices
• Switch, Fuse, Meters, Relays, Circuit breakers,
  
• Equipment
• Consuming Lamp, T/L, motor, heater,
• Production Generator, battery, SPV,
• Transmission Transformer, converter,

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Domestic wiring

• E
• L
• N

M
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Domestic Wiring

• ARCHITECTURAL DRAWING/LAYOUT

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Domestic Wiring
MCB
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Industrial wiring

• 3 phase, 440 V or more, R-Y-B
• Circuit breakers
• Relays
• Motor starters
• Switchgear
• Cable size
• Transformers
• CT, VT
• Panel with meters

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Industrial wiring

• Layouts and routing (similar to piping)
• Cable trench
• Cable tray
• Cable gallery
• Towers

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Industrial wiring
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Wiring Haywire

• Missing wires mid-way through construction
• Long routing of wires extra cost
• Interference with equipment, piping and structure
• Wrong type of cables
• Not enough space to lay cables or provide bends

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Summary

• Output of wiring diagrams
• Cable sizes and lengths
• Routing cable gallery, cable trench designs
• Relay room and cabinets
• Electrical panels and cabinets
• Switchgear
• Scope of supply
• Detailing for civil and mechanical works