The below is a useful grid in calculating what type of electrical circuit you should get installed when architecting out a server room, datacenter rack or networking/telco rack.
The key is the range of the “Total Capacity” in kW. 208v circuits can sustain about 1.75X more kW than a 120v circuit, thus give you more room for growth.
We recently signed up with datacenter provider Cyxtera and they will actually run a 208v, 30Amp circuit to your rack, even if you only ordered 2kW. This way if you grow and add equipment, you don’t have to install a new circuit to your cage, you just pay for more kWs.
North America
Branch Circuit | Voltage | Amperage | Max Load 80% | Phase | Total Capacity |
120v Single-Phase | |||||
120v,20A,SP | 120v | 20A | 16A | SP | 1.92 kW |
120v,30A,SP | 120v | 30A | 24A | SP | 2.88 kW |
208v Single-Phase | |||||
208v,20A,SP | 208v | 20A | 16A | SP | 3.33 kW |
208v,30A,SP | 208v | 30A | 24A | SP | 4.99 kW |
208v,50A,SP | 208v | 50A | 40A | SP | 8.32 kW |
208v,60A,SP | 208v | 60A | 48A | SP | 9.98 kW |
208v,100A,SP | 208v | 100A | 80A | SP | 16.64 kW |
208v Three-Phase | |||||
208v,20A,3PH | 208v | 20A | 16A | 3PH | 5.76 kW |
208v,30A,3PH | 208v | 30A | 24A | 3PH | 8.65 kW |
208v,50A,3PH | 208v | 50A | 40A | 3PH | 14.41 kW |
208v,60A,3PH | 208v | 60A | 48A | 3PH | 17.29 kW |
208v,100A,3PH | 208v | 100A | 80A | 3PH | 28.82 kW |
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