Light circuit loading?

[Raisedonadeere]

The 4' LED fixtures I am using give a spec of 48 watts 4400 lumens and I will probably do a quantity of 12 -14 of those.

The fixture literature doesn't list amps but I assume that would be 120V /48 watts = 2.5 amps. A 20 amp circuit would power 8 of these (20/2.5 =8)

That is 100% duty cycle stuff. Something tells me I should do about 6 lights per 20 amp breaker.

What is the wisdom or code for loading light circuits?

 

[The Cobbler]

your math is wrong. you can easily run 30 or more 48 watt loads on a 15 amp circuit

 

[The Cobbler]

120 volts @15 amps = 1800 watts / 50 watts per fixture = 36 fixtures
120 volts @ 20 amp = 2400 watts/ 50 watts per fixture =48 fixtures

 

[LeeG]

Watts=volts*amps. Amps = watts/volts. 48/120 = 0.4 amps/light

 

[jabelding]

I= w/v * Pf
48/120 =.4 A
14x.4= 5.6 amps for all

 

[Raisedonadeere]

Watts=volts*amps. Amps = watts/volts. 48/120 = 0.4 amps/light

Gentlemen a moment of silence as I slip through this real duh moment.

 

[sberry]

When I do this I use 100 watts to the amp as a formula. We could assume this could run contioious, it's not exact math but easy to get an idea.

 

[Terry D]

A lighting circuit is a continuous load. You can only load it up to 80% of the ampacity of the conductor. So 16 amps is all you can put on a 20 amp circuit

Sent from my SM-G960U using The Garage Journal mobile app

 

[Toomanytools?]

A lighting circuit is a continuous load. You can only load it up to 80% of the ampacity of the conductor. So 16 amps is all you can put on a 20 amp circuit

Sent from my SM-G960U using The Garage Journal mobile app

Yes, I was wondering when this would pop up.