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