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How to comply with Amendment 3

Advice on compliance with Amendment 3 of IET Wiring Regulations, regarding Consumer Units. Our products meet and exceed the regulation for complete protection.

Complying with new Amendment 3 of the IET 17th edition wiring regulations

WHAT ARE THEY ABOUT?Consumer Unit Burning

As of the 1st of July 2015, Amendment 3 to BS7671:2008 Requirements for Electrical Installation (IET Wiring Regulation) came into effect, outlining a new set of regulations which affect all of the consumer units put in new builds in the UK.
The amendment says:

“Within domestic (household) premises, consumer units and similar switchgear assemblies shall comply with BS EN 61439-3 and shall:

I. Have their enclosures manufactured from non-combustive material, or

II. Be enclosed in a cabinet or enclosure constructed of non-combustible material and complying with regulation 132.12.”

What this means for you?

Following numerous reports from fire investigators concerning the Envirograf_metal_consumer_unit_coversincreasing number of fires centred around electrical consumer units with moulded thermoplastic enclosures, Regulation 421.1.201 was introduced.

The intent of Regulation 421.1.201 is the containment of any fire starting within the enclosure or cabinet, minimising the escape of flames as far as is reasonably practicable.

For domestic new builds, this translates to a choice between installing an enclosure manufactured from non-combustible materials around combustible consumer units (or similar switchgear assemblies), or installing more expensive units made from non-combustible materials. In real terms, the former is the more economical option, saving money whilst still meeting the requirements of Regulation 421.1.201.

read more about this regulation:



The Envirograf® product range includes metal enclosures for plastic consumer units, as well as fireproof linings for cable entries on non-combustible units

Metal Consumer Unit Enclosure for plastic CU to comply with Amendment 3 of BS 7671 : 2008

Electrical Fire Protection Units for plastic consumer units & distribution boards.

Plastic units have always been a fire hazard, as normally they are placed in escape routes in flats, houses and intakes etc. Overloading of cables and fuses can cause overheating, leading to fires which can easily spread out of control.

Envirograf® ECU units are made in different sizes to suit your consumer unit & distribution board. Around the unit is a red band of cloth housing intumescent that can be cut with a sharp knife to accommodate cables, conduits and trunking which are already fitted to your units, forming a complete fire seal barrier.
The units are lined with Envirograf® fireproof paper covered with a PVC material. This product is essential in preventing fire damage and, more importantly, in allowing time to evacuate the building, saving lives.

Fire rated linings for sealing cable entries to metal consumer units


The intent of Regulation 421.1.201 is considered to be, as far as is reasonably practicable, to contain any fire within the enclosure or cabinet and to minimise the escape of flames, and this is as true of metal consumer units as it is of plastic ones.

Envirograf® manufactures a range of intumescent linings, which in the event of a fire will seal up the weak points of non-combustible consumer units (cable entries, for example), containing the fire within the non-combustible box.


Insulation liner for metal consumer unit to prevent loose cabling causing the unit to become live


Metal consumer units pose a great risk of becoming live due to overheated cables loosening up and touching the box, which hasn’t been properly earthed. Therefore there is a need for an insulation material to be placed inside the unit to prevent this from happening.

Envirograf® insulation liners consist of a silicone cloth material which should be fitted to the back of the unit using the attached double sided tape.


EnviroBurst Automatic Fire Suppression System


Could you be without your consumer unit, distribution or switch fuse & board for days or hours?
EnviroBurst can immediately put out the fire, causing virtually no damage.

EnviroBurst Automatic Fire Suppression System consists of a sealed thermoplastic tube which will begin to soften when exposed to high temperatures. Once the fire reaches 70°c the tube will burst, releasing a liquid extinguishant into the heart of the fire.

The system is ideal for protecting enclosed areas which pose a high risk of igniting, such as distribution boards or consumer units which can be prone to overheating. It is compact and lightweight, meaning it is easily adaptable to a wide range of purposes. The unit is designed to extinguish fires in the early stages, meaning that in many cases the consumer unit, as well as the wiring, will take only minimal damage and will not need replacing.


Recommended Products

ECU Fire Protection System for Distribution BoardsIntumescent Strips for metal consumer units (SCU)Insulation liner for metal consumer unitEnviroBurst Automatic Fire Suppression System


If you have recently used our ENVIROGRAF® passive fire products, why not share your story with us, so we can publish it here.

We’ll be happy to visit you and write about you and your project ( free publicity ).  Contact us now!

Envirograf ® products are tested to British Standards & European Standards at approved test centres.

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