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.

TC4 is an Electrical Installation Condition Report for premises with over 100 A supply. Use with TC5 Schedule of Test Results for up to 12 ways or TC6 for greater than 12 ways. Also for extra observations use the optional TC7. 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