Multicore Cable And Cable Tray Flashcards
What is the most commonly used finish on cable tray ?
Hit dipped galvanized finish
Name three types of cable tray ?
Light, medium and heavy duty cable tray
What must be done to cable tray once it’s been cut ?
Deburred and sealed with paint were cut to prevent corrosion.
Name two advantages of cable tray ?
- Ease of installation.
2. Economy of time and materials
Cable tray is a exposed conductive part true or false ?
True.
What does NWMJ stand for ?
N= German standard (VDE specifiaction)
Y=PVC (insulation )
M= Mantle ( German for sheath)
J= CPC( includes earth wire)
Where is NYMJ particularly suitable for instillation ?
Damp and wet conditions.
What is the suitable temp range for NYMJ installation?
-40°C to +60°C
What is the internal bending radius of NYMJ?
Factor of 4.
What must be used when terminating NYMJ cable?
Packing Gland
What type of insulation is used in fire performance cables ?
Hight temp insulation like silicon rubber or insudite .
Why is a electrostatic screen used in fire performance cables?
To prevent Electromagnetic interference
Name two application for fire performance cables?
- Fita alarms systems
2. Emergency lighting systems
What does SWA stand for ?
Steel Wire Armour.
Where word you use SWA cable ?
- Heavy sub main distribution
- Underground electrical supplies
- Circuit wired in environment where their is a high liklyhood of mechanical damage.
At what temperature should SWA not be worked ?
0°C
What is the full name of SWA cable ?
XLPE/SWA/PVC
