DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
DOCUMENTS
What travels with a batch.
A balance-of-system order arrives with paperwork or it arrives as a pallet of steel. These are the documents worth asking for, and what each one establishes.
- Material certificate
- Steel grade and coating weight, traceable to the batch
- Coating certificate
- Microns or grams per square metre, because that is the corrosion life
- Thermal calculation
- The ambient assumed, the vent area and who signed it
- Load calculation
- Cable fill, wind case and support centres
- Continuity specification
- Where bonding is required and how it is achieved
- Torque specification
- Per connection type, for the installer to work to
- Continuity record
- Measured at installation, because it cannot be seen afterwards
- Revision statement
- Which revision the batch was made to, and its calculation
An illustrative list for a fictional range. A real programme agrees which documents are required, in what form, and how long they are retained.
The one that is most often missing.
The continuity record. Bonding through coated parts cannot be verified by looking, it is measured once at installation, and it is the first thing asked for after an insulation fault.
Why the coating weight matters more than the finish name.
Because two galvanised parts with the same description have different lives. The coating weight is the number that predicts it, and a name is not a number.