1. MEP201 Mechanical Engineering Drawing 1st semester 2005-06
S R Kale
Lecture
Wiring Drawings

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-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
Wiring (2005)

3. Wiring drawings Input information Wiring outputs Teams of
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 of
Electrical, 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 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)
Wiring (2005)

9. Wiring Elements Switch, Fuse, Meters, Relays, Circuit breakers, …
Wires / Cables
Devices
Switch, 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
Wiring (2005)