How the tools are verified
A compliance calculator that is quietly wrong is worse than no calculator, because it produces a number people act on. So both of ours are built the same way.
Every value a calculator uses is traced to the clause, table or figure it comes from, and that mapping is written down rather than held in someone’s head. Where a standard is silent and we have to assume something, we say so on screen and on the report, labelled as our assumption rather than the standard’s.
The calculation engines are tested against hand-computed cases, including the awkward ones: values sitting exactly on a limit, cases that fall between tables, and the interactions where satisfying one clause removes the need to check another.
The G5/5 calculator went through a full compliance verification before release. The P28 engine is built to the same discipline.
What we do not claim
These tools implement the simplified assessment methods the standards themselves provide. They are screening tools, and the standards are explicit that some situations need a detailed study instead — several disturbing items at one connection point, stochastic loads like arc furnaces, resonance, and anything a network operator wants to model properly.
Where a result lands close enough to a limit that the standard directs you to simulate rather than rely on the simplified method, we say that instead of reporting a pass.
On the standards themselves
The ENA Engineering Recommendations are published by the Energy Networks Association and are licensed documents. Our pages summarise, paraphrase and cite them by clause number. We do not reproduce their text and we do not host copies. For any assessment you intend to submit, work from your own licensed copy.