StacksVerified U.S. regulatory reference

40 CFR Part 53, Table B-4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Test dayLinevoltage,1 rmsRoomtemperature,2 °CComments
011525Initial set-up and adjustments.
112520
210520
312530Adjustments and/or periodic maintenance permitted at end of tests.
410530
512520
610520Adjustments and/or periodic maintenance permitted at end of tests.
712530Examine test results to ascertain if further testing is required.
810530
912520Adjustments and/or periodic maintenance permitted at end of tests.
1010520
1112530
1210530Adjustments and/or periodic maintenance permitted at end of tests.
1312520
1410520
1512530

1 Voltage specified shall be controlled to ±1 volt.

2 Temperatures shall be controlled to ±1 °C.