Datacenter Thermal Guidelines: IEEE 3003 2 Grounding
terminology gec to vd 500kcmil steel armor measured
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.
| standard class | parameter | allowable max | envelope | unit |
|---|---|---|---|---|
| IEEE 3003 2 Grounding | terminology gec | — | reference | — |
| IEEE 3003 2 Grounding | terminology ground bus | — | reference | — |
| IEEE 3003 2 Grounding | terminology grounding electrode | — | reference | — |
| IEEE 3003 2 Grounding | terminology pen conductor | — | reference | — |
| IEEE 3003 2 Grounding | vd 2awg 1 25in rigid steel computed | 10.8 | reference | V/kA/100ft |
| IEEE 3003 2 Grounding | vd 2awg emt computed | 20.5 | reference | V/kA/100ft |
| IEEE 3003 2 Grounding | vd 2awg flexible conduit computed | 435 | reference | V/kA/100ft |
| IEEE 3003 2 Grounding | vd 500kcmil steel armor computed | 38.3 | reference | V/kA/100ft |
| IEEE 3003 2 Grounding | vd 500kcmil steel armor int pe measured | 5 | reference | V/kA/100ft |
| IEEE 3003 2 Grounding | vd 500kcmil steel armor measured | 35 | reference | V/kA/100ft |
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