Do not add nameplate and measured load
Original diagram. Not a site record.
Three numbers get added because they share a unit. They are not the same series. A nameplate is what the machine was labeled. A design kilowatt is what the drawing claimed. A measured load is what a live point said, at a time, from a path you can name. Adding them produces a fourth number nobody measured. That number will be quoted for a year.
The used-capacity cell takes the measured point, live, or it stays blank. Blank is allowed. Write why: missing, stale, or never in the claim. Stale refuses the cell. Design does not fill it while you wait for the meter. A closed breaker is not a load. Do not infer kilowatts from a status bit.
Plot design and measured apart. One line with both is the defect. A whiteboard total in the meeting is a new calculation. It does not get signed in the corridor. If a roll-up already exists, it is a calculated point: inputs written, stale inputs refused or shown. "Whichever looks calmer" is not an input list.
Redundancy is a design claim until a test shows what remains when one machine is actually out. N+1 on a slide does not fill the cell. Note the drawing beside the cell. Do not put it inside.
A future IT load is a plan. It does not enter the used cell, and it does not enter the available cell unless you can say the method in one sentence and operate to it.
From Run the Data Center Day, Tristan, Data Center Field Guides. No store link until the Kindle edition is listed.
Related: A nameplate is not used capacity.
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