Wallis

Founded 50 years ago, they have a long tradition of providing first class earthing and lightning protection equipment.

All their equipment is designed and manufactured to meet BS, European and International standards at our own facilities in Nottingham, UK, which include a foundry and machine shop.

With extensive experience and technical expertise, A. N. Wallis can design and advice on lightning protection schemes to suit your individual requirements. They have designed and supplied materials for projects including high rise buildings, bridges, telecoms installations, towers and stadiums.

A well designed earthing system is essential to ensure protection of personnel and equipment from danger associated with fault currents or lightning within buildings or areas falling within their "zone of protection'.

Earthing system design considerations

To achieve an efficient earthing system it is essential that a low electrical resistance to earth is achieved, using good quality conductors with sufficient cross sectional area to carry the expected current flow. The conductors must also have a high corrosion resistance and must meet internationally recognised European and British earthing standards.

Other factors to consider when designing an earthing system are:

A survey is required to determine ground resistivity.

Soil moisture content:

more moisture always reduces soil resistance.

Chemical composition of soil: certain salts and minerals affect soil resistivity.

Temperature: if the ground is frozen its resistance becomes much higher.

The extent of any buried services which could affect the earth termination networks.

Details of metallic service pipes, rails, tanks etc. which may need bonding into the earth system to prevent the danger of side flashing.

The area available to place earth electrodes, this may

be limited.

Maintenance & life of an earth system:

It is important to properly maintain an earth circuit to ensure it retains its ability to conduct the same current carrying capacity as it did when it was originally installed. Earth rod resistances should be regularly checked. Corrosion and fault currents can cause high resistance joints leading to overheating. However, if an earth system is correctly installed and maintained it should last for many years.

Cu-nnect Exothermic Welding:

This, coupled with our rapid delivery promise, makes A. N. Wallis your first choice every time.

Our large Cu-nnect range of products is used worldwide on power stations, substations, transmission lines;

petro-chemical facilities and pipelines; oil and gas facilities and sports stadia.           All backed by over fifty years of A. N. Wallis experience for that extra piece of mind.

Cu-nnect exothermic welding is a simple, economical method of making permanent, very high quality electrical connections, The process uses the high temperature reaction of copper oxide and aluminium, within a semi-permanent graphite mould, to form electrical connections mainly between copper to copper or copper to steel.

No outside source of power or heat is required when using the Cu-finecl system.       It is also light and completely portable, making it ideal for field use.                         It is a straightforward method which requires very little training in order to safely obtain a quality, maintenance free connection, therefore making it both lime and cost effective.

Making a Cu-nnect joint is a simple procedure which requires a mould, weld powder, handle clamp and various tools and cleaning accessories.

The Cu-nnecl electrical connection Is a fusion of high conductivity, high copper content alloys which produces a molecular weld. This weld has at least twice the cross-sectional area of the conductors being joined and a current-carrying capacity equal to or greater than that of the conductors, enabling it to withstand repeated fault currents. The weld will not loosen or corrode and is an integral part of the conductor.

For any additional technical advice or information contad our Sales team.