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Update power documentation

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Jeremy Stretch
2020-07-30 13:36:40 -04:00
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docs/models/dcim/powerfeed.md
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# Power Feed
A power feed identifies the power outlet/drop that goes to a rack and is terminated to a power panel. Power feeds have a supply type (AC/DC), voltage, amperage, and phase type (single/three).
A power feed represents the distribution of power from a power panel to a particular device, typically a power distribution unit (PDU). The power pot (inlet) on a device can be connected via a cable to a power feed. A power feed may optionally be assigned to a rack to allow more easily tracking the distribution of power among racks.
Power feeds are optionally assigned to a rack. In addition, a power port – and only one – can connect to a power feed; in the context of a PDU, the power feed is analogous to the power outlet that a PDU's power port/inlet connects to.
Each power feed is assigned an operational type (primary or redundant) and one of the following statuses:
* Offline
* Active
* Planned
* Failed
Each power feed also defines the electrical characteristics of the circuit which it represents. These include the following:
* Supply type (AC or DC)
* Phase (single or three-phase)
* Voltage
* Amperage
* Maximum utilization (percentage)
!!! info
The power usage of a rack is calculated when a power feed (or multiple) is assigned to that rack and connected to a power port.
The power utilization of a rack is calculated when one or more power feeds are assigned to the rack and connected to devices that draw power.