Datacenter Thermal Guidelines

ASHRAE TC9.9 thermal environment guidelines for datacenter equipment classes (A1-A4, B, C, HI air-cooled; W17-W45 liquid-cooled) — recommended and allowable operating envelopes for inlet dry-bulb temperature, humidity, dew point, elevation, and rate of change. Also includes IEEE 3003.2-2014 grounding electrode resistance, conductor impedance, shock voltage, and voltage drop data; IEEE 3003.1-2019 grounding method selection table; and IEEE 3004.11-2019 dual-tie bus differential protection fault scenarios.