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17th edition
BS 7671:2008 (known as the 17th Edition) Requirements for Electrical Installations or, the IEE Wiring Regulations, came into effect from 1st July 2008. New installations, alterations and additions designed on or after this date must comply with the new requirements of 17th Edition.

Under the 17th Edition of the Wiring Regulation requirements, there are a number of so called ‘Special Locations’. These are locations where there is considered to be a significant increase of risk of electric shock or fire.

All Vysa-Therm thermostats are protection rated IP 21 or higher and are thus suitable for installation within locations containing a bath or a shower, outside Zones 0, 1 or 2.

Section 701 in the 17th Edition covers locations containing a bath or a shower. The zones have been simplified. Zones 0, 1 and 2, as defined in the 16th Edition, are retained. Zone 3 is removed and, importantly, all circuits now need 30mA RCD protection.

Under the 17th Edition, thermostats such as the Vysa-Therm 3000 and Touch Screen are now permitted in bathrooms provided that they are located outside of zone 2 (at least 60 cm from the edge of zone 1).

Under the 17th Edition, electric heating units embedded in the floor and intended for heating the location continue to be permitted provided that they are covered by an earthed metallic grid or have an earthed metallic sheath connected to the local supplementary equi-potential bonding.

All Vysa-Mat heating mats and cables have an earthed metallic sheath connected to the earth conductor within the cold tail connection lead and thus fully comply with the requirement. An additional earthed metallic grid is NOT required. Vysa-Film is NOT suitable for bathroom use but Vysa-Foil Mats may be used instead.

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