Safety & Commissioning

Beyond Type AC: Getting Earth-Leakage Protection Right on Bosch Drive Retrofits

Adding a Bosch drive to an existing panel changes the residual current signature that the upstream device is expected to detect. This guide separates Type A, Type B and Type B+ devices, sets out what BS 7671 and the manufacturer's instructions actually require, and gives a commissioning and periodic-test routine that satisfies the regulator without stopping production.

Nov 9, 2026

The Evidence Trail Behind a Safe Stop: Commissioning STO and SS1 After a Bosch Drive Retrofit

A retrofitted Bosch drive often introduces Safe Torque Off and Safe Stop 1 into a machine that previously had neither as monitored functions. The wiring is the straightforward part; the difficulty lies in proving the functions work, measuring their response, and holding records that satisfy PUWER, insurers and a maintenance audit three years later.

Nov 8, 2026