---
title: Engine Generators
category: Electrical / Power Distribution Equipment
toc_depth: 3
description: >
− When to use: Packaged stationary engine-generator sets serving emergency, legally required standby, and optional standby loads in commercial, institutional, and industrial buildings. Covers diesel and natural gas (and bi-fuel) sets typically in the 30 kW to 2 MW range, with on-board sub-base fuel tanks or external fuel supply, paired with an automatic transfer switch (see [[syncs/automatic-transfer-switches]]).
+ When to use: Packaged stationary engine-generator sets serving emergency, legally required standby, and optional standby loads in commercial, institutional, and industrial buildings. Covers diesel and natural gas (and bi-fuel) sets typically in the 30 kW to 2 MW range, with on-board sub-base fuel tanks or external fuel supply, paired with an automatic transfer switch (see [[sync/automatic-transfer-switches]]).
Not intended for: Portable or towable generators, prime power generation in continuous duty service (off-grid or utility-paralleled prime power), grid-tied microgrid inverters or battery storage systems, photovoltaic backup inverters, or stationary fuel cells. Medium-voltage generators above 600V at the generator terminals are also outside this standard's scope.
---
…4 unchanged lines
## Each set comprises a reciprocating internal combustion engine, a directly coupled synchronous alternator, a unit-mounted controller, batteries and charging system, cooling and exhaust systems, fuel system, and an enclosure or base, furnished as a single integrated assembly listed to UL 2200. {note}
−## A standby generator is part of a system and shall be coordinated with the automatic transfer switch (see [[syncs/automatic-transfer-switches]]), the grounding and bonding system (see [[syncs/grounding-and-bonding]]), the raceways and conductors that connect it to the distribution system (see [[syncs/raceways-and-conduit]] and [[syncs/conductors-and-cables]]), the concrete pad or structural support on which it sits (see [[syncs/concrete-pads]]), and the equipment identification scheme (see [[syncs/equipment-labeling]]).
+## A standby generator is part of a system and shall be coordinated with the automatic transfer switch (see [[sync/automatic-transfer-switches]]), the grounding and bonding system (see [[sync/grounding-and-bonding]]), the raceways and conductors that connect it to the distribution system (see [[sync/raceways-and-conduit]] and [[sync/conductors-and-cables]]), the concrete pad or structural support on which it sits (see [[sync/concrete-pads]]), and the equipment identification scheme (see [[sync/equipment-labeling]]).
## The performance commitments in this standard assume those coordinated scopes are in place. {note}
…954 unchanged lines
### Anchorage to the housekeeping pad shall be by post-installed anchors sized for the certified base shear and overturning moment, installed per the certification documentation.
−### Anchor design shall be coordinated with [[syncs/concrete-pads]].
+### Anchor design shall be coordinated with [[sync/concrete-pads]].
### Where the project is an essential facility per ASCE 7 (Importance Factor 1.5), the set shall also be functional after the design seismic event; certification shall demonstrate operability and not only structural survival.
…88 unchanged lines
### The generator set shall be set on a reinforced concrete housekeeping pad sized to extend at least 6 in. beyond the set's footprint on all sides, with a minimum thickness sufficient to accept the anchor embedment depth required by the seismic anchorage design, and an upper surface elevation of at least 4 in. above the surrounding floor or grade.
−### Pad construction shall be coordinated with [[syncs/concrete-pads]] and with the structural drawings.
+### Pad construction shall be coordinated with [[sync/concrete-pads]] and with the structural drawings.
### Conduit penetrations, fuel line penetrations, and grounding electrode connection points shall be cast or sleeved into the pad before concrete placement.
…30 unchanged lines
### Power and control conduit entries shall be located per the shop drawings, with watertight fittings on outdoor enclosures and bushings or hubs as required for the cable system.
−### Conduits shall be coordinated with [[syncs/raceways-and-conduit]] and conductors with [[syncs/conductors-and-cables]].
+### Conduits shall be coordinated with [[sync/raceways-and-conduit]] and conductors with [[sync/conductors-and-cables]].
−### The generator frame and the alternator neutral (where applicable) shall be grounded per NEC Article 250 and per [[syncs/grounding-and-bonding]].
+### The generator frame and the alternator neutral (where applicable) shall be grounded per NEC Article 250 and per [[sync/grounding-and-bonding]].
−### The Contractor shall confirm the transfer switch arrangement before bonding the neutral, and shall coordinate with the transfer switch submittal under [[syncs/automatic-transfer-switches]].
+### The Contractor shall confirm the transfer switch arrangement before bonding the neutral, and shall coordinate with the transfer switch submittal under [[sync/automatic-transfer-switches]].
### A generator that is a separately derived system shall have its neutral bonded to ground at the set and a grounding electrode connection per NEC 250.30.
…28 unchanged lines
## The available fault current at the generator main breaker and at the load side of the transfer switch shall be calculated, labeled, and dated per NEC 110.24.
−## Equipment labeling format shall follow [[syncs/equipment-labeling]] conventions.
+## Equipment labeling format shall follow [[sync/equipment-labeling]] conventions.
# Delivery, Storage, and Handling {toc}
…60 unchanged lines
### Training shall cover normal operation, the controller interface, the exerciser configuration, the alarm and shutdown response procedure, NFPA 110 testing and recordkeeping, and routine maintenance intervals.