Electrical Installation Design Guide, 3rd edition by The IET

The Calculations for Electricians and Designers (3rd Edition) book provides step-by-step guidance on the design of electrical installations, from domestic installation final circuit design to fault level calculations for LV systems.

Amendment No. 3 publishes on the 5 January 2015 and comes into effect on 1 July 2015. All new installations from this point must comply with Amendment No. 3 to BS 7671:2008.

Updated to include the new requirements in Amendment No. 3 to BS 7671:2008, the Electrical Installation Design Guide reflects important changes expected to:

Definitions throughout the Regulations
Earth fault loop impedances for all protective devices