If you are weighing up consumer unit upgrades at a Pontypridd address, the useful detail is below rather than in a brochure. Earthing arrangement (TT vs TN-S vs TN-C-S), main fuse rating, R1+R2 and Zs readings, RCD timings — every number on the certificate is one we actually measured on the day, not pre-filled. Conditions locally play a part — exposure, damp and the way older tightly-packed Taff valley terraces in Treforest and Cilfynydd were built all affect what we find. The alternative — ignoring if the service head — tends to cost more later.
On tightly-packed Taff valley terraces in Treforest and Cilfynydd in particular, board size, RCD layout, earthing and notifiability confirmed tends to shape the plan more than the specification does. The materials rarely change; the route and the access do. It is the kind of detail that separates a tidy job from a callback. Pontypridd property owners generally want to know two things about consumer unit upgrades: is it necessary, and what will it involve.



