What's so special about our leads?

At Tough Leads, we only supply premium quality extension leads, built to withstand every day on-site conditions. We believe that using only the highest quality components creates leads which are not only safer, but will significantly out last any other extension lead, at a price which remains affordable.

  • We only use industrial quality H07RN-F cable to ensure that the leads can withstand harsh conditions.
  • All 13A and 15A plugs and sockets are rubberised for extra durability.
  • Extension leads use the highest quality German manufactured Mennekes 16A IP44 plugs and sockets, which have incredible strength and durability to withstand on-site use. PME branded connectors are used for 32A applications.
  • All extension leads are constructed to comply with BS7671.
  • 16A leads use the larger 2.5mm cable to ensure performance at long lengths and for use with high currents.
  • Custom lengths can be made, together with any combination of plug and socket available across the globe (subject to them being safe and meeting regulations for use within the UK or delivery destination).
  • All items are hand made in our specialist workshop.
  • All items are PAT tested and marked with a unique number for full traceability.

What’s so special about H07RN-F rubber cable?

We only use H07RN-F rubber cable, as it is specifically manufactured for harsh environments and its safety and performance under extreme conditions simply cannot be beaten. Our leads will withstand tough daily on-site use for considerably longer than any other type of cable.

  • Extremely flexible, bending to 6 times its overall diameter.
  • Very good mechanical resistance to impact and abrasion, making it ideal for harsh environments on-site.
  • Unlike normal PVC cables, it doesn’t tangle itself into a giant birds nest! No matter how long it is stored coiled up, it instantly straightens.
  • Resistant to accidental exposure to a wide range of chemicals, including most oils and greases.
  • Whist we would never recommend that you submerse an extension lead, it’s good to know that just in case it ends up running through a puddle, it’s actually submersible to a depth of 100m.
  • Retains its flexibility and performance over a wide temperate range from -25 to 60°C.
  • BS7671 IEE regulations require the use of H07RN-F on construction and demolition sites.

Why not use blue arctic flex?

Blue ‘arctic’ flex is commonly used for extension leads available at major DIY stores and online.

Arctic cable was originally designed for 110v construction site use, where it offered flexibility down to -25°C.

Whilst a blue 230v version is available, it is not tested to the same standards and is not recommended for use below 5°C. Further information on this key limitation can be found in this excellent article within Wiring Matters.

Compared to H07RN-F it is far more prone to mechanical and UV damage.

Aren’t CY ‘flexible armoured’ cables becoming trendy?

There does seem to be a growing trend to use CY ‘flexible armoured’ cables for extension leads. However, other than looking nice, we’re not convinced that they are at all suitable as:

  • The PVC sheath is not waterproof, has low UV resistance and should not be used for prolonged periods outside.
  • The sheath is prone to mechanical damage.
  • The minimum operating temperature is -5°C, and it becomes stiff at low temperatures.
  • It can only be bent to 10 times its overall diameter.
  • It requires proper glands to earth the metal braid to ensure safety, which are often omitted and are too large to be used with 13A plugs and sockets.