GFCI LINE and LOAD Reference Diagrams
Compare GFCI receptacle-only and downstream protection diagrams, identify LINE and LOAD roles, and locate the exact manufacturer instructions.
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LINE and LOAD roles
On the conventional GFCI receptacle arrangement described by the linked instructions, LINE identifies the incoming supply connection. LOAD identifies the optional protected output used for an appropriate downstream arrangement. Neither word identifies a neutral terminal by itself: the applicable connection pair has distinct conductor roles.
| Label / feature | Reference meaning | Separate check |
|---|---|---|
| LINE | Incoming supply side of the documented device | Identify both conductor terminals using the actual markings and instructions. |
| LOAD | Optional downstream protected connection where provided | Not a second incoming feed and not required in every arrangement. |
| TEST / RESET | Device test/reset controls | Follow the exact manufacturer test instructions, including power-up and indication behavior. |
| Ground terminal / bonding connection | The device’s equipment grounding connection as documented | GFCI protection does not create an equipment grounding conductor. |
| Indicator / alarm | A model-specific status feature | Colors, flash patterns, and reset behavior are not universal across devices. |
Receptacle-only protection
Separate branches connected elsewhere on a supply circuit do not become protected just because they share a box with this device. Determine the actual topology from the circuit and the manufacturer instructions.
Downstream protection concept
LINE/LOAD reversal is a recognized installation problem. Reset or indication behavior depends on the model; do not identify a correct connection only by whether an indicator turns on.
Use the exact instructions
- Match the manufacturer, catalog number, ratings, terminal arrangement, and instructions.
- Apply qualified-person work practices, isolation, and verification appropriate to the job. These functional drawings are not a live-work procedure.
- Check circuit topology, grounding/bonding, conductor identification, box fill, and downstream labeling requirements separately.
- Follow the complete manufacturer testing sequence after an authorized installation; this page does not replace it.
The linked audible-alarm GFCI instruction sheet is a specific product example. Do not transfer all of its terminal or indicator details to a different device.
For where protection may be required use the existing GFCI/AFCI requirement finder. For other functional diagrams see single-pole, 3-way, and 4-way switches.