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Trade Specifications

tagged "Electrical"

The following Trade Specifications must be read in conjunction with all other Contract documentation including; Tender Letter, General Terms, Conditions of Contract for Works, Labour Only and Purchase Orders, General Construction Notes (England & Wales), Suppliers and Sub Contract Works - Customer Charter and the Company's Occupational Safety, Health & Environmental Management System.

Our aim is to enable our sub-contractors and suppliers to access key Commercial information such as Terms & Conditions, Trade Specification, etc. online as soon as they are updated and revised. We hope that this will ensure that our supply chain is always fully informed as quickly as possible.

Whilst available online, this information is also available from the Commercial Departments at our Divisional offices and will form part of any contract we place (as set out in the Order).

Please be aware that bogus web sites seeking fees for the chance of working with major contractors exist.

Jon Hayward
Senior Group Commercial Manager


Revision AO 01.02.2022

General section – a) with reference to the procurement of materials, installation of materials and on-site working methods to ensure the correct standards and compliance is achieved on site. This trade specification is to be read alongside working drawings, BDW Standard Details, manufacturer's literature and the Barratt Construction Best Practice Guide.

Defective Workmanship – e) with reference to works undertaken by a preceding trade.

Sub-Contractor – l) where fire proofing or fire stopping measures are likely to follow this trade, it is essential the preparation work is sufficiently prepared.

20.2 - updated to read as per locations on working drawings.

20.6 added – When installing electrical sockets, avoid locating electrical sockets back to back on compartment walls, however, where this is necessary, putty pads are to be installed between them.

Sign off clause updated.

Revision AN 01.07.2021

Section 20.5 – updated to note that Electric Built-In ovens must be hard wired.

Section 11.2 – following the cancellation of Construction Alert 46, the requirement for installing Tenmat FF109 200x200 fire hood to all Downlighters within intermediate floor joist zones has been removed. The schedule of materials has also been updated to remove this item.

Section 7.7 added – Electrical cable in close proximity to gas pipe without being suitably protected. BS 6891:2015 (Specification for the installation and maintenance of low pressure pipework of up to 35mm on premises) states in section 8.4.2. that ‛Where installation pipework is not separated from electrical equipment or cables by an insulating enclosure, dividing barrier, trunking or conduit, it shall be spaced as follows – at least 25mm away from electricity supply and distribution cablesʹ. The Contractor should install a back plate to ensure the cable is routed away from the gas pipe.

Revision AM 01.04.2021

Tenmat Fire Hoods requirements have been added to Downlights fitted to Intermediate Floors.

Revision AL 01.08.2020

k) Sub-Contractor

Health & Safety note added; loft access shall be gained only with the use of proprietary crawl boards.

27. Schedule of Materials

Deta Downlighters part numbers have been updated with current fire rated product reference numbers.

Deta reference S1299 – 2 gang switched and 3 USB charging ports added to kitchen as standard

Revision AK 20.09.2019

Section 5.14 Broadband - Cat module and wiring changed to CAT6.

Section 15.8 Condensation Traps – Revised to include connection with the trap and drain fitted to the extraction fan.

Section 21.3 Fire Protection - Electrical sockets for Built in Ovens and Integrated Dishwashers must be installed in accordance with standard details.

Section 24.4 Television – Connection of Sky and Virgin Media Plates. Refer to the latest requirements detailed in the Sky and Virgin
pre-wiring specifications.

Section 27 Schedule of Materials – Door Entry Systems schedule updated in accordance with Comelit specification update. Deta Carbon Dioxide detectors reference has changed from 1141 to 1142.

Revision AJ 01.01.2019

This document has been subject to review due to the new I.E.T regulations 18th edition, which will be subject to for any new electrical installations designed (tendered) from the 1st of January 2019.

Removal of equipotential bonding requirements.

Group Supplier information has been updated for Door Entry Systems.

Material Schedules have been updated with revised product codes for Hagar consumer units. The Contractor to assess whether surge protection is required based on the plot's location in the country (using a lightning strike rate map) plus a rural and suburban / urban factor in accordance with I.E.T. regulations 18th edition.

Removal of door chimes / bells to all ranges from the material schedule.

Addition of Deta carbon dioxide detectors (Scotland only)

Revision AI 01.07.2018

Fire protection within the specification has been reviewed.

Section 20 has been newly added.

An update of smoke alarm product reference numbers have been amended.

Revision AH 01.01.2018

15.3 Rewording - Kitchen (Where no hood extract)

Fans in this location must be capable of giving extraction at a rate not less than 60 litres/second extraction, ducted to outside through sleeve, duct should be built in brickwork as work proceeds or 30l/s if the fan is placed over the hob.

15.4 Addition - Were the fan is ducted to a roof tile vent the EnviroVent condensation kit must be used, flexible ducting to be pulled taught and to be kept to a minimum as per the domestic ventilation compliance guide.

15.5 Addition - Were a utility fan is ducted to a roof tile vent the EnviroVent condensation kit must be used, flexible ducting to be pulled taught and to be kept to a minimum as per the domestic ventilation compliance guide.

15.8 New - All of the above equipment to be manufactured by Envirovent.

Schedule of materials updated accordingly 3 revised product numbers.

Revision AG 01.07.2017

Changes to product codes/names have changed.

Electrical Downlighter Installation

Barratt / David Wilson Homes Standard Drawing DB-SD09-003