EXCEPTION: | The following transformers are exempt: |
| 1. Transformers that meet the Energy Policy Act of 2005 exclusions based on the DOE 10 C.F.R. 431 definition of special purpose applications. |
| 2. Transformers that meet the Energy Policy Act of 2005 exclusions that are not to be used in general purpose applications based on information provided in DOE 10 C.F.R. 431. |
| 3. Transformers that meet the Energy Policy Act of 2005 exclusions with multiple voltage taps where the highest tap is not less than 20 percent more than the lowest tap. |
| 4. Drive transformers. |
| 5. Rectifier transformers. |
| 6. Auto-transformers. |
| 7. Uninterruptible power system transformers. |
| 8. Impedance transformers. |
| 9. Regulating transformers. |
| 10. Sealed and nonventilating transformers. |
| 11. Machine tool transformer. |
| 12. Welding transformer. |
| 13. Grounding transformer. |
| 14. Testing transformer. |
Table C405.6
Minimum Nominal Efficiency Levels For 10 C.F.R. 431 Low Voltage Dry-Type Distribution Transformers
Single Phase Transformers | Three Phase Transformers |
kVAa | Efficiency (%)b | kVAa | Efficiency (%)b |
15 | 97.70 | 15 | 97.89 |
25 | 98.00 | 30 | 98.23 |
37.5 | 98.20 | 45 | 98.40 |
50 | 98.30 | 75 | 98.60 |
75 | 98.50 | 112.5 | 98.74 |
100 | 98.60 | 150 | 98.83 |
167 | 98.70 | 225 | 98.94 |
250 | 98.80 | 300 | 99.02 |
333 | 98.90 | 500 | 99.14 |
| | 750 | 99.23 |
| | 1000 | 99.28 |
a | kiloVolt-Amp rating. |
b | Nominal efficiencies shall be established in accordance with the DOE 10 C.F.R. 431 test procedure for low voltage dry-type transformers. |
C405.7 Dwelling unit electrical energy consumption. Each dwelling unit located in a Group R-2 building shall have a separate electrical meter. A utility tenant meter meets this requirement. See Section C409 for additional requirements for energy metering and energy consumption management.
EXCEPTION: | Dwelling units in other than Group R-2 multi-family and live/work units are not required to provide a separate electrical metering at each dwelling unit where electrical usage is metered separately for each of the following building end uses: |
| 1. Dwelling units. |
| 2. Sleeping units. |
| 3. Commercial kitchens. |
| 4. Central laundries. |
[Statutory Authority: RCW
19.27A.020,
19.27A.025,
19.27A.160 and chapter
19.27 RCW. WSR 19-24-040, § 51-11C-40507, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW
19.27A.025,
19.27A.045,
19.27A.160, and
19.27.074. WSR 17-10-062, § 51-11C-40507, filed 5/2/17, effective 6/2/17; WSR 16-13-089, § 51-11C-40507, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW
19.27A.025,
19.27A.160, and
19.27.074. WSR 16-03-072, § 51-11C-40507, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW
19.27A.020,
19.27A.025 and chapters
19.27 and
34.05 RCW. WSR 13-04-056, § 51-11C-40507, filed 2/1/13, effective 7/1/13.]