2365 203 Conduit and Trunking Calculations

If you have a 4m run on conduit with 3 bends and the following cables, What size conduit is required?

2 x 1.5mm stranded

3 x 4mm Stranded

3 x 6mm stranded

If you have a 3m run on conduit with 0 bends and the following cables, What size conduit is required?

4 x 1.5mm solid

2 x 4mm stranded

2 x 6mm stranded

The following PVC insulated cables are to be installed in steel cable trunking:

10 off 4mm

10 off 6mm

10 off 10mm

Calculate the size of cable trunking that would be suitable for this application.

What is the maximum space factor for trunking?

• 75%

• 50%

• 35%

• 45%

What are the typical sizes for conduit?

• 5, 10, 20, 30, 40, 50

• 15, 20, 25, 30, 35, 40

• 16, 20, 25, 32, 38, 50

What is the Cable factor for a 6mm piece of stranded PVC cable placed into Trunking

• 21.2

• 34.5

• 21.02

• 45

What is a disadvantage of Steel Conduit

• Needs to be glued

• can become brittle over time

• Can Corrode or rust

• Can Be used as a CPC

What of the following is an advantage of PVC Trunking

• Not as strong as Steel

• Easy to Install

• Needs a separate CPC

• Does not offer as good fire protection

Tags

NGSS.MS-PS1-3