EKEvgenii Konkinincalcengineer.hashnode.dev·4d ago · 14 min readThe Cable Crosstalk Mistake That Starts With the Sign of dBCable crosstalk calculations often fail before anyone checks the actual cable. Not because the math is impossible.Not because NEXT, FEXT, ACR-N, and ACR-F are exotic ideas. But because engineers mix t00
EKEvgenii Konkinincalcengineer.hashnode.dev·Jul 3 · 11 min readThe Signal Propagation Delay Mistake That Starts With “It’s Just a Cable”Signal delay is easy to underestimate. A control cable looks short.A fiber run looks clean.A coax path looks simple. Someone says: “It’s just a cable. The delay will be negligible.”Sometimes that is t00
EKEvgenii Konkinincalcengineer.hashnode.dev·Jun 30 · 11 min readThe Diversity Factor Mistake That Starts With Adding Every Peak Load TogetherElectrical load calculations often become too conservative before the engineer even opens the equipment schedule. A panel serves several loads. Each load has its own maximum demand. Someone adds every00
EKEvgenii Konkinincalcengineer.hashnode.dev·Jun 26 · 12 min readThe Data Center PUE Mistake That Starts With a Snapshot NumberPUE is one of the most common data center efficiency metrics. It is also one of the easiest to misuse. An engineer walks into a facility, reads total power from the main meter, reads IT power from a U00
EKEvgenii Konkinincalcengineer.hashnode.dev·Jun 22 · 11 min readThe Emergency Lighting Battery Mistake That Starts With Nameplate Amp-HoursEmergency lighting calculations often look easier than they really are. A fixture schedule shows the number of emergency lights.A battery label shows amp-hours. Someone multiplies amp-hours by voltage00