tool box

Wire Colour Codes

Q: What wire colours are used for 415V 3-phase AC?

• L1 = Red

• L2 = Black

• L3 = Grey

• Neutral = Blue

• Earth = Green/Yellow

Q: What colours are used for 240V 1-phase AC

• Live (L1 or Phase) = Brown

• Neutral = Blue

• Earth = Green/Yellow

Q: What is the wire colour for 110V DC?

• Black

Q: What is the wire colour for 110V AC?

• Grey

🔧 Flashcard 2:

Panel Wiring & Earthing

Q: What wires are used in panel wiring?

• 1.5mm² and 2.5mm² tri-rated white wire

Q: What is used for earthing panels?

• 1 x 75mm² tri-rated wire

• 50x4mm or 50x6mm earth tape

Cable Types

Q: What is a Cleveland multi-core cableS

• XLPE insulation, LSZH sheath, armoured, black outer

• For mains, control, and fixed wiring

• Sizes: 1.5mm² to 16mm²

• Voltage: 600/1000V

Q: What are telephone cables made of?

• Tinned copper

• LSZH insulation

• Standard: ESI 09-6 Section 4.5

Cable Function Use

Q: What are multi-core and panel cables used for

• Control panels

• Switchgear

• CTs and VTs (protection and metering)

• AC/DC supplies

• Alarm circuits

• Tap changers

• Remote indication

Crimp Colour Codes

Q: What are the crimp colours and sizes?

• Red = 1mm² – 1.5mm²

• Yellow = 1.5mm² – 2.5mm²

• Blue = 4mm² – 6mm²

Q: What colours are used for CT and VT ferrules?

• CT = Red ferrule (IDs A, B, C, D)

• VT = Yellow ferrule (IDs E, F, G)

Telephone 20-Pair Colour Codes

Q: What are the 4 base wire colour pairs in a Cleveland 20-pair cable?

1. White/Blue

2. Red/Blue

3. Black/Blue

4. Yellow/Blue

Then matched with:

• Orange, Green, Brown, Grey

Cable Gland Sizes

Q: What gland size fits 2c–4c 2.5mm² or 5-pair cable?

A:

• 20s

Q: What gland size fits 7c 2.5mm² or 10-pair?

A:

• 20L

Q: What gland size fits 12c or 20-pair?

• 25mm

Q: What gland size fits 19c–27c

• 32mm

Q: What gland size fits 37c 2.5mm²?

• 40mm

Tap and Drill Sizes

Q: What drill size do I need for a 6mm tap?

A:

• 5.5mm drill

Q: What drill size is used for 10mm tap?

A:

• 8.5mm drill

(Other sizes also:

4mm tap = 3.5mm drill

5mm = 4.5mm

8mm = 6.8mm

12mm = 10.2mm