#### Alwayslearningelec

##### Senior Member

- Location
- NJ

- Occupation
- Estimator

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- Thread starter Alwayslearningelec
- Start date

- Location
- NJ

- Occupation
- Estimator

- Location
- New Jersey

- Occupation
- Journeyman Electrician

Looks like each light is 25 watts. What voltage are you using, 277?

- Location
- NJ

- Occupation
- Estimator

It's deisgn build so that info is not given but I would assume that would be more effecient so I willassume/qualify 277v.Looks like each light is 25 watts. What voltage are you using, 277?

- Location
- New Jersey

- Occupation
- Journeyman Electrician

How many lights on a circuit? You could put 72 on a single 20 amp circuit. 1800 Watt/25=72

- Location
- NJ

- Occupation
- Estimator

Is that 80% loading?How many lights on a circuit? You could put 72 on a single 20 amp circuit. 1800 Watt/25=72

1800 watts is the watts for a 20@ circuit @ 277v?

- Location
- New Jersey

- Occupation
- Journeyman Electrician

Yes 80% for continuous load.Is that 80% loading?

1800 watts is the watts for a 20@ circuit @ 277v?

- Location
- Upstate S.C.

Also, too many LED fixtures can cause false trips. Don't ask how I know. I just don't know the cut off number.

And when using dimmers, you are severely restricted in the load with LED's

RC

- Location
- SE USA as far as you can go

- Occupation
- Engineer, Registered

The OP voltage is 208Y/120V, not 277V.

- Location
- New Jersey

- Occupation
- Journeyman Electrician

Yes and post #3 says 277.The OP voltage is 208Y/120V, not 277V.

- Location
- NJ

- Occupation
- Estimator

Just curious why does it say 48W in the cut sheet?Looks like each light is 25 watts. What voltage are you using, 277?

- Location
- NJ

- Occupation
- Estimator

And the 1800W # is the watts for a 20A circuit correct?Yes 80% for continuous load.

- Location
- New Jersey

- Occupation
- Journeyman Electrician

Not sure, what you've posted says 25.0 W. How many were you looking to put on a circuit?Just curious why does it say 48W in the cut sheet?

- Location
- Ocala, Florida, USA

- Occupation
- Electrician/Estimator/Project Manager/Superintendent

You started off by saying you have a 120/208 distribution system.It's deisgn build so that info is not given but I would assume that would be more effecient so I willassume/qualify 277v.

- Location
- NJ

- Occupation
- Estimator

However many allowed ...but need to make sure wattage I'm calculating is correct . It says 25 and also 48. Either way it's 1800/fixture wattage.Not sure, what you've posted says 25.0 W. How many were you looking to put on a circuit?

- Location
- NJ

- Occupation
- Estimator

Yes but it's not designed so I just figured. But it would be better to distribute the power to the poles at 277v( since it's very long distances) I'd think even if I need to put transformer by service.You started off by saying you have a 120/208 distribution system.

- Location
- NJ

- Occupation
- Estimator

GM. Just so I'm clear the 1,800W values comes from where?

- Location
- New Jersey

- Occupation
- Journeyman Electrician

Continuous load no more than 80% of the branch circuit rating. You started out by saying in the OP 120/208 volts so I can see the confusion because you later stated 277 volts. In my original example I used 120 volts. {20 amps*120 volts*80%=1800 watts} The value will change based on the circuit voltage.GM. Just so I'm clear the 1,800W values comes from where?

- Location
- NJ

- Occupation
- Estimator

1800W is for 277/480. What's the wattage for 120/208v?Continuous load no more than 80% of the branch circuit rating. You started out by saying in the OP 120/208 volts so I can see the confusion because you later stated 277 volts. In my original example I used 120 volts. {20 amps*120 volts*80%=1800 watts} The value will change based on the circuit voltage.

- Location
- Clearwater, FL - USA

- Occupation
- Sr. Electrical Designer/Project Manager

Nope - 80% loading for a 20A circuit at 277 is 4432 watts. At 25 watts each you could put 177 fixtures per circuit, at 48 watts you could put 92 fixtures per circuit.Is that 80% loading?

1800 watts is the watts for a 20@ circuit @ 277v?