Table
Extension/Plaster Ring Volume Contribution
Extension/Plaster Ring Volume Contribution reference with assumptions and boundary notes.
Reference boundary
Box and ring catalogue reference only. It does not perform box-fill calculations or replace the marked volume on the actual box or ring.
Reference table
Reference common extension-ring and plaster-ring added volume examples for catalogue comparison.
| Box or ring type | Ring depth (in) | Added volume (mL) | Added volume (in3) | Boundary |
|---|---|---|---|---|
| 4 in square | 0.5 | 123 | 7.5 | catalogue volume reference only; use the marked volume on the actual ring or extension |
| 4 in square | 1 | 246 | 15 | catalogue volume reference only; use the marked volume on the actual ring or extension |
| 4 in square | 1.5 | 369 | 22.5 | catalogue volume reference only; use the marked volume on the actual ring or extension |
| 4-11/16 in square | 0.5 | 164 | 10 | catalogue volume reference only; use the marked volume on the actual ring or extension |
| 4-11/16 in square | 1 | 328 | 20 | catalogue volume reference only; use the marked volume on the actual ring or extension |
| 4-11/16 in square | 1.5 | 492 | 30 | catalogue volume reference only; use the marked volume on the actual ring or extension |
Use notes
- Use this table for preliminary reference and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.