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

TC1 is an Electrical Installation Certificate for domestic or similar premises up to 100 A incoming supply. Use with TC5 Schedule of Testing Results for up to 12 ways or TC6 for greater than 12 ways. 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