provisions might have previously technically precluded the use of wireless systems and overcomes this by pointing out that issues relating to power supplies, fault monitoring and integrity and performance may not be the same for hard wired and radio linked systems.

Special recommendations are also given to their use in HMOs.

WIRING OF MAINS POWERED SMOKE AND HEAT ALARMS

When installing, any cable may be used which is suitable for domestic mains wiring, provided it is in accordance with the relevant parts of BS 7671.

•There is no requirement for fire resistant cable and the use of red- sheathed cable is not required when installing Grade D, E and F systems

•6243Y mains cable is recommended using the third core for the interconnect circuit. The earth wire must not be used for the interconnect circuit. The maximum recommended cable run is 250 metres, with 1mm2 or 1.5mm2 cable

Amendment No 2 to BS 7671: 2001 allows 'harmonised' cable colours to be used for installations after 31st March 2004 (they must be used for installations commencing after 31st March 2006). The NICEIC recommends that 6243Y cable with the following colours should be used for smoke alarm systems.

Live

- Brown

Neutral

- Grey (oversleeve

 

blue at terminations)

Interconnect

- Black

Great care should be exercised in ensuring correct identification of the wiring connections as an interconnected smoke/heat alarm system will suffer irreparable damage if the live and neutral connections are reversed, or if a 240V phase conductor is connected to the interconnect terminal.

•Connect to an independent circuit at the distribution board if the alarm does not have a standby supply - Grade E

•RCD Protection is generally not required, but if used it should be dedicated only to the smoke alarm circuit or be independent of circuits supplying sockets or portable equipment

•Smoke alarms should not be installed in new or renovated buildings until all work is completed (including floor coverings) and the building has been fully cleaned, unless using an Easi-fit style alarm. Excessive dust and debris from building work can contaminate the smoke chambers and cause false alarms. It will also invalidate the guarantee. If alarms must be installed before work is finished, either use an ‘Easi-fit’ alarm or ensure that the alarm is completely covered, particularly around the edges, with the dust cover that is supplied with each of our smoke alarms

Where appropriate, cable penetrations should be fire-stopped. If there is any danger of impact damage, abrasion or rodent attack, appropriate protection should be fitted.

A convenient and reliable alternative to hard wired interconnection is now readily available in the form of RadioLINK from Aico (see page 22).

CERTIFICATION AND PAPERWORK

The installer should certify that the installation conforms to BS 5839: Pt.6 for the correct Category and Grade of system. If any variations have been agreed to, these should be duly noted. The Code provides a model certificate for installers to complete.

Suppliers of the equipment should provide the occupier of the dwelling with clear and readily understood information on the system and its use. All alarms should come complete with user instructions, designed to be easily understood, covering such topics as

operation, testing, maintenance, false alarms, escape plans and siting.

TESTING AND MAINTENANCE

Regular routine testing and maintenance is very important and should be considered at the design stage.

The Code states that the user has a responsibility for routinely testing the system and should be supplied with simple instructions on how to do this.

All smoke alarm systems should be tested at least weekly using the integral test button. Remote test and false alarm control switches can be used to avoid the need for the user to reach up to the alarms. Systems should also be checked if the occupier has been away or the power has failed.

In Grade D to F applications, smoke alarms should be cleaned periodically in accordance with manufacturers’ recommendations. Where experience shows that excessive levels of dust are compromising the effectiveness of the system, more frequent cleaning and servicing may be required.

NEGLIGENCE

The exact question of negligence and liability falls outside the scope of the standard. It is up to the courts to judge these issues.

From some considered opinion covering the area of legal liability we quote below extracts from an article written on behalf of the National Housing and Town Planning Council (NHTPC) by Martin Daley, to whom we are grateful for granting us permission to quote from his work.

According to Daley, the NHTPC has been fortunate in having sight of independent research on smoke alarm liability by Dr Anne Everton. The following ten situations, based on Dr Everton’s research, should, says Daley, ‘be avoided at all costs’:

1Where the smoke alarm is defective in design

17

Page 16 Page 18
Page 17
Image 17
Aico RFD Wiring of Mains Powered Smoke and Heat Alarms, Certification and Paperwork, Testing and Maintenance, Negligence
Page 16 Page 18

RFD specifications

Aico RFD, a pioneering name in the field of digital technology, has carved a niche as a leader in the design and manufacturing of advanced digital communication devices. Focused on providing high-quality solutions, Aico RFD stands out for its innovative approach and commitment to meeting the evolving needs of consumers and businesses alike.

At the heart of Aico RFD's offerings is a range of wireless communication devices that leverage cutting-edge technologies. These devices are equipped with state-of-the-art features, ensuring seamless connectivity and superior performance. Key features include high-speed data transfer, enhanced signal reliability, and extended range capabilities, making them suitable for various applications across industries.

One of the standout technologies utilized by Aico RFD is Frequency Hopping Spread Spectrum (FHSS). This technology enhances security and reduces the likelihood of interference, allowing for clear communication even in crowded environments. Aico RFD also incorporates advanced encryption protocols, ensuring that users can rely on the confidentiality of their transmitted information.

Another notable characteristic of Aico RFD devices is their user-friendly interface. Designed with the end-user in mind, these devices offer easy navigation and setup options, making them accessible to a diverse range of users, from tech-savvy individuals to those less familiar with technology. Additionally, Aico RFD products are known for their ergonomic designs, which enhance user comfort during prolonged use.

Durability and reliability are also hallmarks of Aico RFD's product line. Built to withstand the rigors of daily use, these devices are often designed with robust materials and weather-resistant features. This makes them ideal for both indoor and outdoor applications, further broadening their usability.

Moreover, Aico RFD is committed to sustainability. Their products are engineered to be energy-efficient, contributing to lower environmental impact without compromising performance. This focus on sustainability aligns with the growing global demand for eco-friendly technology solutions.

In conclusion, Aico RFD exemplifies innovation in the wireless communication sector. With a solid blend of cutting-edge technology, user-focused design, and commitment to sustainability, Aico RFD is well-positioned to lead the way in shaping the future of digital communication. Whether for personal use or business applications, Aico RFD devices deliver excellence that users can rely on for superior performance and connectivity.
Top Page Image Contents