A Guide To Using Dimmable Receptacles APP NOTE (048109).pdf

Key Takeaways

This Lutron application note provides guidance on using their special dimmable receptacles (DDTR & HDTR) for table/floor lamps.

Why Special Receptacles?

The National Electrical Code (NEC) prohibits standard receptacles from being used for dimming. These special receptacles are designed to accept only Lutron's RP-FDU replacement plug, ensuring NEC compliance and preventing use with other devices.

Compliance & Wiring:

Compliance: The system comprises a "special-purpose connector" specifically for table/floor lamp dimming. DDTR and HDTR receptacles are ULR Listed for use with ULR Listed Lutron dimmers.
Wiring:

HDTR: Requires two separate hot feeds (one constant, one dimmed) and a means to simultaneously disconnect them at the panelboard (NEC 2020, Article 210.7). Use feed-through type dimmer panels for easier installation.
DDTR: Can be wired similarly to standard receptacles but must not be ganged with another switched receptacle unless both outlets are required for NEC compliance.

Lamp Types & Dimmers:

Any ULR Listed two-wire lamp with SPT-2 cord can be used, provided the load type, wattage, and dimmer compatibility match.
Avoid built-in on/off switches: Lamps with these switches should be controlled solely through the dimmer to prevent issues. Lamps with internal dimmers are not recommended.
Neutral Wire Connection: Highly recommended for RadioRA 2 and HomeWorks QS systems for easier commissioning without requiring the lamp to be physically connected.

Products:

Receptacles: DDTR (Duplex) & HDTR (Half) models in various ampere ratings (15A & 20A).
Replacement Plug: RP-FDU, available in colors (Brown & White).

Key Considerations:

Always use the correct dimmer for your lamp load.
Ensure proper wiring and grounding according to NEC guidelines.
Refer to Lutron's application note #616 for suitable products.