The Kewtech range of 17th Edition certification books are fully up to date and comply with BS7671 amendment 3. The family tree is split into two streams, new installations and existing installations. The testing results schedules are common to both streams.

TC2 is a standalone certificate book for Minor Works. All pages are duplicated.
For incoming supplies up to 100 A use TC1 plus the results pages either TC5 or TC6
For incoming supplies over 100 A use TC8 plus the results pages either TC5 or TC6