IEEE · Institute of Electrical and Electronics Engineers
Standards organization whose electrical, switchgear, and media-sanitization specifications are written into data-center design bases and contracts alongside ANSI and NFPA.
Current numbers
ptp4l / phc2sys / ts2phcthe linuxptp daemons: distribute IEEE-1588, slave system clock to PHC, steer PHC from GNSS/PPS
5–20% TDDIEEE 519 current-distortion (TDD) limit at the PCC, sliding with the Isc/IL short-circuit ratio; voltage THD capped at 5% (1–69 kV) / 8% (<1 kV)
5% THD-VIEEE 519-2022 voltage-distortion limit at the PCC for 1-69 kV; 3% per individual harmonic; 8% below 1 kV