Technical Area

Welcome to our new 'technical area', the home for all the information you need to help answer your cable questions. If you cannot find the information you are after then please contact our technical support team at:

02380 295222

Prysmian Technical Guides

Our technical guides have been written by our Technical support team to help you with your installations. Click here to view the most up to date guides.

These documents are uncontrolled when printed, always check the website to ensure the document is the most up to date issue.

Frequently Asked Questions (FAQs)

1. Where is my nearest Prysmian stockist?

To find your nearest stockist please contact us

2. When did the new wiring regulations commence?

The 18th edition of the wiring regulations were published in July of 2018.  Read more here.

3. What is changing in the new wiring regulations?

Proposed changes to the wiring regulations include a reduction in the energy consumption of electrical installations. If the proposal is accepted it could result in the specification and installation of larger conductor power cables. Read about the wiring regulations.

4. How do I spot a fake DoP?

Check out our handy checklist on how to spot a fake declaration of performance right here.

5. What does the CPR mean for electrical contractors?

From the 1st July 2017 the Construction Products Regulation (CPR) came into effect for cable: from that point it was made illegal to distribute or sell non CPR compliant cable for permanent installation in buildings. Read about what effect CPR will have on electricians here.

6. What happens if I find electric cables in water?

Firstly, it is important to isolate the installation from the mains supply before attempting to check or repair flooded cables. For obvious reasons, the sooner the flood recedes and action is taken the more likely it is that the cables will not be adversely affected. Find out what to do when the water subsides, click here.

7. How long do Prysmian cables last?

While our contractual guarantee for cables is 12 months from delivery electricians, electrical engineers and their clients can be confident that Prysmian cable will have a design life of 25 years or more. Check out what impacts the life of a cable.

8. How do I store cables?

Prysmian’s very large, long, or heavy cables, like our armoured power cables, are supplied in bulk with the cable wound onto either a metal, or more commonly, a wooden drum. This allows for ease of handling, transportation, delivery and ultimately for installation. Find out more about cable handling and storage.

9. What is the minimum installation temperature for electric cables?

For temperatures above 5°C, the installation of any cable should not be an issue. Below that temperature, however, the minimum handling temperature will depend on several factors including: the type of cable, the severity of cable bends, the speed of bending and the manner in which the cable is installed. These guidelines are also applicable for cables being installed when the ambient temperature is above 5°C, but which have been stored at a lower temperature in the previous 24 hours (48 hours for large drums of cable). Check out our installation temperature for electric cables guide. 

10. What is Electromagnetic Compatibility (EMC) and why does it happen?

EMC problems are considered to be more likely to occur when un-armoured and un-screened cables are used in close proximity. The best way to reduce interference is when both the influencing power cable and the influenced control cable are separated by the maximum possible distance and/or both cables are either armoured or screened. For more on how how to avoid this issue, click here.

11. What should I do if I find non CPR-compliant cable?

If you think you have spotted non-compliant cable, it is REALLY IMPORTANT that you report it. Firstly, you should bring it to the attention of the person from whom you bought the cable (it’s their legal responsibility to make sure the products are compliant). If you don’t get a satisfactory answer from them, then you should report it to your local Trading Standards Office and to the Approved Cables Initiative on 0208 946 6978 or For more information, click non-compliant cable.

12. Is my cable CPR compliant?

We recommend all purchasers should check that all cable products they consider:  

To read more about how CPR applies to electrical contractors and cable, click here.

13. What is the green stuff coming out of cable that I’ve seen?

The green goo coming out of, usually twin and earth cable, is the product of a reaction between decomposing plasticiser (a plasticiser is an oily liquid used in the manufacture of PVC compounds) and the copper conductors of PVC cables. It’s better known as cable ‘greening’. Read more about what to do when you encounter cable greening.

14. What is a medium voltage cable?

Medium voltage or MV cables are rated between 6.6 and 33kV and we manufacture the full range in Britain including joints and terminations. MV cables are used by Distribution Network Operators and electrical contractors to connect substations and major constructions such as rail networks, industrial parks and conurbations and form the local power infrastructure.  For further details regarding MV cables to BS6622 or BS7835, please contact our technical department:

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