Emergency and Standby Power Systems

Read revision 6

Revision 6 · Aug 26, 2026 +11 −5

Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 5 to Rev 6 in Emergency and Standby Power Systems.
---
title: Emergency and Standby Power Systems
…115 unchanged lines
- "Written Owner instructions (test intervals, log format, recordkeeping)"
- "Owner training sign-off"
−default: [NFPA 110 integrated acceptance test record (signed and dated), As-built system one-line and load schedule, Final selective coordination study (as-installed settings), Operation and maintenance manuals (NFPA 110 Ch. 8 schedule), Written Owner instructions (test intervals, log format, recordkeeping), Owner training sign-off]
+default:
+ - "NFPA 110 integrated acceptance test record (signed and dated)"
+ - "As-built system one-line and load schedule"
+ - "Final selective coordination study (as-installed settings)"
+ - "Operation and maintenance manuals (NFPA 110 Ch. 8 schedule)"
+ - "Written Owner instructions (test intervals, log format, recordkeeping)"
+ - "Owner training sign-off"
```
…106 unchanged lines
### Many systems use both: a generator for the bulk of the standby load and a stored-energy source to bridge the engine-start interval for loads that cannot tolerate the 10-second gap. {note}
+### The alternate source shall be selected to match the load class, the required transfer time, and the required runtime.
+
```datasheet
label: Primary Alternate Source
…8 unchanged lines
```
−### The alternate source shall be selected to match the load class, the required transfer time, and the required runtime.
−
### The engine-generator set, where used, shall be specified per [[sync/generators]].
### The stored-energy source, where used, shall be specified per [[sync/dc-battery-systems]] and applied per NFPA 111.
−### This standard establishes which source serves which load and what each source shall accomplish; the construction of each source is set by its component standard. {note}
+### This standard establishes which source serves which load and what each source shall accomplish; the construction of each source is set by its component standard.
## Stored-Energy Source for Egress Illumination {toc}
…116 unchanged lines
## The transfer scheme is the set of decisions about how each load class is moved between the normal and alternate sources: how fast, by what kind of transfer, in what priority, and with what neutral treatment. {note}
−## The transfer switches themselves are specified per [[sync/automatic-transfer-switches]]; this standard sets the system-level requirements that those switches shall satisfy. {note}
+## The transfer switches themselves are specified per [[sync/automatic-transfer-switches]]; this standard sets the system-level requirements that those switches shall satisfy.
## Required Transfer Time by Class {toc}
…269 unchanged lines
## Coverage shall extend to defects in materials and workmanship and to the system's failure to meet its commissioned transfer times under normal standby use.

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