It is unlikely that actuators would be the only load since smoke detectors and other life safety may be on the same breaker. It is wise to leave spare power available. Always use the run draw. See local codes for allowable loading.

The equation is VA = Volts X Amps.

Wire runs must be large enough gauge or short enough that there is no voltage drop on way to actuators.

**FSLF:** From the data sheets the 24 VAC draws 5.0 VA. It is wise to load a transformer only 75% to ensure good voltage and a longer life.

For a 40VA transformer, 75% = 30VA. Then 30VA/ 5VA = 6 actuators.

For a 100VA transformer, 75VA load = 75VA / 5VA = 15 actuators.

The 120 VAC draws 18 VA according to data sheet.

Using VA = volts X amps, 18 = 120 X amps, or the FSLF120 draws 18/120 = .15A.

Then given a 20A breaker and an allowable load of 75% = 15A, 15A / .15A = 100.

100 actuators could be placed on a 20A breaker.

**FSNF:** From the data sheet, both draw 27VA or the 120V amp draw is .23A. A 20A breaker loaded to 15A can carry 15 / .23 = 65 actuators. A 40VA transformer should only have one FSNF on it. A 75VA should have maximum 3 and a 100VA transformer should have maximum 4. Transformers are very forgiving of slight overdraws. This is not true of breakers and the data sheet notes should be read and observed.

**FSAF_A:** From the data sheet, the 24V is 32VA so 1 actuator can go onto a 40VA transformer, A 100VA transformer is required for two actuators. The 120V draw is 0.25A and loading to 11 amps on a 15A breaker would allow 40 actuators.

**What? How can these numbers be true given the higher draws competitors show?**

Yes, the numbers above are true. At 120V on a 20A breaker:

- FSLF is 100
- FSNF is 65
- FSAF_A is 60