Flexible conduit pipes are commonly used in electrical installations to protect and route wiring. They are available in several standard sizes, typically measured in outer diameter. The sizes you mentioned — 20mm, 25mm, 32mm, 40mm, and 50mm — are standard conduit diameters used in many regions, especially under metric specifications.
Here’s a quick overview of what each size is commonly used for:
• 20mm: Light-duty applications such as single lighting circuits or control wiring.
• 25mm: Heavier lighting circuits, small power circuits.
• 32mm: Larger power cables or multiple circuits.
• 40mm: Main power feeds or multiple bundled circuits.
• 50mm: Industrial settings, high-capacity cable routing.