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AEI Cables - Frequently Asked Questions

Click on the drop down links below to read a frequently asked question:

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What are the essential changes in the 17th Edition Wiring Regulations?

There are a couple of rules which should be highlighted.

One requires that all 13A socket-outlets - plus those up to 20A, for use by 'ordinary persons' - should be protected by a 30mA RCD. In bathrooms, for example, RCD protection is also required on all circuits including lighting.

Another regulation concerns protection of cables buried in wall plaster or enclosed within partition walls. Armoured or screened cables to appropriate standards will help here or another option is to use metal protection strip.

A screened cable complying with BS 8436 will have had to pass a test during which the cable is penetrated by a nail to make sure an RCD is tripped before it could cause an accident.

The Wiring Regulations are produced by the Institution of Engineering and Technology (IET) and its website provides more substantial information.

How do I decide what is the best cable for the job in hand?

We provide comprehensive product information on this website, see the Products section and then click on the relevant sector and you will find summary details and also the option to download datasheets to help you make the decision about what is the most appropriate product.

Our Cable Sizing Wizard is also another service we offer to make sure you are choosing the relevant, correct size of cable.

Which product is ideal for use in studded partition walls?

AEI Cables has designed a new cable called Protec. Meets and exceeds BS 8436, it satisfies the 17th Edition IEE Wiring Regulations and is ideal for use in walls, partitions and building voids.

Where do I find out about current ratings?

We now provide a comprehensive advice booklet covering many current ratings which is now downloadable.

Do I need to provide RCD protection on a shower circuit?

Under the 17th Edition, all circuits in a bath/shower room require 30mA RCD protection.

What standards do your products meet?

Our products are manufactured to and tested against a wide range of standards including British Standards (BS), European and International Standards (EN and IEC), as well as a large number of industry standards.

Do I need to provide protection for cables buried in walls?

Mechanical protection of cables directly buried in a wall is not required if it is installed in one of the following zones:

Within 150 mm from the top of the wall or partition;

Within 150 mm of an angle formed by two adjoining walls or partitions;

The cable is running either horizontally or vertically to an accessory or switchgear on the wall. This zone now extends to the reverse side of a wall or partition 100 mm thickness or less if the location of the accessory or switchgear can be determined from that reverse side.

If installed outside of these zones, the cable must have an earthed metallic sheath or be enclosed in earthed earthed metallic conduit/trunking or be buried at a depth of more than 50 mm or be mechanically protected from penetration by nails/screws etc.

AEI Cables is known as a specialist in fire performance products, why?

We have a reputation for excellence in the field of fire performance. Our unrivalled Total Solution package for fire performance includes Mineral Insulated Cable (MIC), Enhanced Firetec for demanding applications to BS 5839-1 (02) and Standard Firetec for more straightforward installations to BS 5839-1 (02). MIC is known as the only true fire survival cable, capable of withstanding temperatures up to 1083°C, the melting point of copper.

Can you produce cable for a one-off situation?

Yes, our technical team can design tailor-made products across the range of markets we serve.

How can I be sure that I don't use non-compliant / faulty cable?

Our products are approved to the highest standards, whether it's BASEC, LPCB or Lloyd's Register. When cable arrives on site check more specifically what has been purchased for you and inspect the product. Is it what was specified? Commissioning tests and inspections are the last opportunity to enforce the specification. Make sure these are rigorously carried out and if problems are found check what is installed against the original specification again, including brands and trade marks if used. If there are problems found with or questions are raised about a cable, don't automatically strip out the cable, but seek advice. If necessary get the cable tested. We fully support the initiatives to rid the market of these rogue cables.

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AEI Cables
Pinetree Centre
Durham Road
County Durham

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