Blog / Tag
#procurement
4 posts filed under this tag, newest first.
Choosing an RS485 to Modbus TCP gateway
Transparent tunnel or protocol gateway, multi-master handling, unit ID mapping and isolation — the specification that decides whether it works in year two.
7 min read
Choosing a VFD: what actually decides the size
Drives are sized on current, not kW — and the current on the box is before derating. Overload class, control mode, cable length and harmonics.
7 min read
Copper or aluminium: where aluminium stops being cheaper
Aluminium needs 1.6 times the cross-section for the same current — and still costs less per metre. The crossover, and the four places it goes wrong.
8 min read
How to read a cable datasheet without getting caught out
Reference conditions, two rating columns, mV/A/m versus ohms per km, one-second fault ratings and how to decode A2XFY — the fine print that decides the size.
7 min read