Low Voltage Dry-Type Distribution Transformers

The Multi-State Appliance Standards Collaborative included state standards for low voltage dry-type distribution transformers, until the state standards were preempted by a Federal Standard, effective January 1, 2007.

Please note: California still requires certification for products subject to federal standards. Please see Manufacturer Product Certification for more information on how to certify products.

The standards for distribution transformers cover only low voltage (600 volts or less) dry-type distribution transformers that are designed to operate at a frequency of 60 Hertz and have a rated power output of not less than 15 kVa.

Federal Energy Conservation Standards for Low-Voltage, Dry-Type Distribution Transformers
Single-phase Three-phase
kVA

Efficiency (%) kVA Efficiency (%)

15…………………………...
25…………………………...
37.5…………………………
50…………………………...
75…………………………...
100………………………….
167………………………….
250………………………….
333………………………….

97.7
98.0
98.2
98.3
98.5
98.6
98.7
98.8
98.9

15……………………………….
30……………………………….
45……………………………….
75……………………………….
112.5…………………………....
150……………………………...
225……………………………...
300………………………….......
500……………………………...
750……………………………...
1000…………………………….

97.0
97.5
97.7
98.0
98.2
98.3
98.5
98.6
98.7
98.8
98.9

Note:  All efficiency values are at 35 percent of nameplate-rated load, determined according to the DOE test procedure. 10 CFR Part 431, Sub-part K, Appendix A.

Source: “Energy Conservation Program for Commercial Equipment: Distribution Transformers Energy Conservation Standards; Final Rule.” Code of Federal Regulations Title 10, Pt. 431, 2007 ed.

References

Energy Policy Act of 2005: http://edocket.access.gpo.gov/cfr_2006/janqtr/pdf/10cfr431.196.pdf