47 C.F.R. § 73.31
(a) An application filed with the FCC for a new station or for an increase in power of an existing station shall specify nominal power rounded to two significant figures as follows:
| Nominal power (kW) | Rounded down to nearest figure (kW) |
|---|---|
| Below 0.25 | 0.001 |
| 0.25 to 0.99 | 0.01 |
| 1 to 9.9 | 0.1 |
| 10 to 50 | 1 |
[50 FR 18821, May 2, 1985, as amended at 53 FR 1031, Jan. 15, 1988]