The Mercian
Member
Agree fully with this, I’d be amazed if this isn’t the de facto standard for all ROC facilities, let’s hope No one decided to skimp on the spec.The flip side is that it can take a certain scale before redundancy is worth it. Does every individual signalbox have generator backup? Whereas with something of the scale of the ROC you absolutely will put in UPS, generator backup, redundant grid feeds etc.
It then comes down to maintenance and testing systems on a regular basis . There’s no right answers here, though CIBSE guidance is always a good start point, but it will as ever depend on budgets and what controlling FM/Engineers feel are suitable for the risks presented.