Rooms, Corridors and Locks: Zones, Conduits, Foundational Requirements and Security Levels

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 52m

Khalid Mansoori has spent twenty years drawing hazardous-area zones on plot plans. Leila Darwish, the site's data architect, needs to put a new historian link through three of his colleagues' firewalls. When she shows him a 62443 zone drawing, he recognises the shape immediately and the meaning not at all. Part two of The Deep End's 62443 series uses that conversation to explain zones and conduits, the seven foundational requirements, what security levels one to four really mean, the difference between SL-T, SL-C and SL-A, and why the Purdue model and 62443 zones are not rivals.

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