Panel Wiring
Site: | PETA |
Course: | 1021 DR Tuesday EngFit MOET TechSup |
Book: | Panel Wiring |
Printed by: | Guest user |
Date: | Saturday, 21 September 2024, 6:04 PM |
Description
Useful Information
1. Cable types, Identification (Colours) and contols
Cable types
Thermoplastic and Thermosetting cable what is the difference
While thermoplastic materials have the advantage of being able to be reformed, thermosetting materials are generally more heat resistance and have greater strength. The operating temperature of any cable is an important parameter in determining the maximum allowable current.
TRI-RATED CABLE - H05V2-K / H07V2-K / BS6231
Application Range
High temperature, flame retardant cable designed for use in the switch control, relay and instrumentation panels of power switchgear and for purposes such as internal connectors in rectifier equipment, motor starters and controllers. Tri-rated cable is sometimes referred to as BS 6231 cable, H07V2-K or panel wire.
Product Features
- Oil resistant
- Flame Retardant – IEC 60332-1
Design
- Fine Wire Strands Class 5 BS EN 60228 (Previously BS 6360)
- PVC insulation TI3 according to BS EN 50363
Packaging
- Sections from 0.5mm up to 16mm - 100 meter cardboard reels
- Sections from 25mm up to 300mm - Any Lengths available
Ribbon Cable and Shaped SWA (Steel Wire Armour)
Drain wire vs Shield
SY Cable
Thermoplastic
Polyvinyl chloride (colloquial: polyvinyl, vinyl; abbreviated: PVC) is the world's third-most widely produced synthetic plastic polymer (after polyethylene and polypropylene). About 40 million tons of PVC are produced each year. PVC comes in two basic forms: rigid (sometimes abbreviated as RPVC) and flexible.
Thermosetting
Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links. It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, and insulation for high tension (high voltage) electrical cables.
PVC vs XLPE for insulating cable: What's the difference? ... This is because PVC has a maximum working temperature of 70°C which is exactly what is needed for standing building cables, whilst XLPE has a maximum working temperature of 90°C. Cables that are insulated with XLPE can run a higher current in the conductors.
Control Diagram from BS7671 Page 122
Difference between relay and contactor
A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V.
Relay
Relay
Contractors
Terminations and connections
Crimp terminals, piggyback and dual crimp terminals
Cable support for Panels
Slotted Trunking and Spiral wrap
Lacing Cord and Flexible Conduits (Metal and Plastic)
Electrical steel conduit and trunking
Electrical steel trunking
Steel Tray Ladder and Basket
Basket
Fixing and fastenings, Ties and i-dents
Snap on wire markers
Hand held Printers
Programmable controllers
A programmable logic controller (PLC) or programmable controller is an industrial digital computer which has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, or robotic devices, or any activity that requires high reliability, ease of programming and process fault diagnosis ...
What are programmable encorers
The latest programmable encoders offer both incremental and absolute functionality on one hardware platform and can be programmed with a WiFi connection. ... For instance, a traditional programmable encoder can allow users to program basic encoder parameters such as the resolution or the electronic interface level
Proportional–integral–derivative controller (PID controller or three-term controller)
https://en.wikipedia.org/wiki/PID_controller
Pid controller block diagrams
Remote Start Stop Devices
A Start push button (Green) is NO (Normally open) and wired in parallel with other remote NO, Start buttons then connected in series with NC ( Normally Closed) Stop (Red) push buttons. Start buttons when pressed close the control circuit and activate the retaining contact via the control solenoid coil, Stop buttons open the control circuit and deenergise the solenoid coil
ISOLATORS
Interlocks and Safety switches