Post on 30-Dec-2015
description
MEP201
Mechanical Engineering Drawing1st semester 2005-06
S R Kale
Lecture
Wiring Drawings
Wiring (2005) 2
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-
controlIC 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
Wiring (2005) 3
Wiring drawings
Input information• Schematic, P&I drawings• Equipment G.A. drawings• Layout drawings• Logic for interlocks
Wiring outputs• Wiring schematic/diagram• Wiring/Cable routing (to scale, with BoM)
Teams ofElectrical, I & C, civil, engineers
Wiring (2005) 4
Types of wiring
• Power supply and transmission• I & C signal• Telephone• Data cables
Wiring (2005) 5
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
Wiring (2005) 6
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
Wiring (2005) 7
Types of wiring diagrams
• Wiring schematic (One-line diagram)Power connections
• Control system diagram
• Interlock wiring / Sequence control wiring
• Data bus
Wiring (2005) 8
Power
Power Supply - available at one location.Power Demand – supply to each equipment.
A.C.No. of phases: 1 or 3Voltage: 240, 415 V; 3.3, 11, 25, 220, 400, 600 kVFrequency: 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)
Wiring (2005) 9
Wiring Elements
Wires / Cables
DevicesSwitch, Fuse, Meters, Relays, Circuit breakers, …
Equipment Consuming: Lamp, T/L, motor, heater, …Production: Generator, battery, SPV, …Transmission: Transformer, converter, …
Wiring (2005) 10
Domestic wiring
E
L
N
M
Wiring (2005) 11
Domestic Wiring
ARCHITECTURAL DRAWING/LAYOUT
Wiring (2005) 12
Domestic Wiring
MCB
Wiring (2005) 13
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
Wiring (2005) 14
Industrial wiring
Layouts and routing (similar to piping)
• Cable trench• Cable tray• Cable gallery• Towers
Wiring (2005) 15
Industrial wiring
Wiring (2005) 16
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
Wiring (2005) 17
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