Electrical Derating

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Hi All,

In HP Oneview, There is a term "Electrical Derating". Could you please explain the term "Electrical Derating"

Regards

(CID:99156979)

[DCIM_Support]

Hi Emrekoca,

I can't specifically state how HP is referring to this but I'll give you an example from the APC UPS world. A 120 volt Smart-UPS 2200 has a load rating of 1980 Watts. It also needs another hundred or so watts for charging so for an example, let's say 2000 watts. It usually comes with a 20 amp plug. 20 amps at 120 volts is 2400 watts. This circuit should be able to hold the UPS and it's load. 

If you now replace the plug on the UPS with a 15 amp plug, you have de-rated the UPS. You've made it so the UPS and circuit it's connected to can not hold the size load the UPS was capable of. A 15 amp circuit at 120 volts is only capable of 1800 watts. If you were to load the UPS to it's limit it would trip the circuit breaker. The UPS would go to battery and the load would eventually drop. In essence, the UPS and circuit together are closer to a 1500 VA UPS than a 2200.

Additionally, a 15 amp circuit breaker can hold a 1800 watt load but not for a large period of time. It's fine for an inrush but over time the breaker will trip. For extended periods, the breaker itself is de-rated to 80% or 1440 watts. A more technical explanation of this can be found in k-base FA173063.

Hope this helps.

Steve

(CID:99156981)

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