Chart
Generator transfer switch selection map
Compare portable generator, standby generator, transfer device, neutral, and bonding decision points before backup-power work.
Chart boundary
Does not approve generator connection, neutral bonding, transfer equipment, service work, or inspection outcome.
one line
Backup power connection path
The map separates portable load supply, panel transfer, standby systems, and grounding/bonding questions.
Scopegenerators and backup powerX-axisgenerator connection architectureY-axistransfer and neutral questionReviewAnnualNextTransfer switch selection workflow
portable loadsCord-only
- generator receptacle -> cord loads
- no premises bus
- manufacturer operating limits
selected circuitsManual panel backup
- generator inlet -> transfer device
- utility isolation
- neutral / bonding review
integrated systemAutomatic standby
- generator -> ATS -> service equipment
- selected or whole-home loads
- fuel and controls
Transfer devicemanual / interlock / ATS
Neutral switchingsystem-specific
Load scopeportable / critical / whole home
Decision table
Show which generator connection questions should be separated before equipment selection.
Scroll sideways to keep row labels aligned with hidden columns.
| Condition | Chart reading | Next check | Boundary |
|---|---|---|---|
| Cord-connected portable use | Keep loads isolated from premises wiring | Generator safety instructions | No operating procedure |
| Manual transfer to panel | Transfer device and load selection matter | Generator sizing calculator | No transfer approval |
| Automatic standby generator | ATS, neutral, and service details matter | Qualified design review | No installation approval |
| Ground-fault or neutral question | System bonding arrangement must be reviewed | Manufacturer and authority guidance | No bonding decision |
Notes
- Treat this chart as a planning and conversation aid only.
- Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
- Use the linked calculator or table when the task needs project-specific arithmetic.
Source links
Open the underlying public sources before treating the chart as project guidance.