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

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