maximum number of lights

Old 06-05-06, 06:55 PM
Thread Starter
Join Date: Dec 2001
Posts: 158
Received 0 Votes on 0 Posts
maximum number of lights

What is a safe number of lights for a single 15 amp breaker. I currently have three double fluorscents and one standard 60 watt light on a line. I'd like to add another lamp....would that be safe?

Old 06-05-06, 07:02 PM
pgtek's Avatar
Join Date: Oct 2004
Location: north Carolina
Posts: 1,398
Received 1 Vote on 1 Post
i would have 12 lights on one circuit 15 amp with 60w bulb
or a combo of 8 (4 outlet and 4 lights)
Old 06-05-06, 07:04 PM
Banned. Rule And/Or Policy Violation
Join Date: Feb 2006
Location: North of Boston, MA.
Posts: 2,112
Received 0 Votes on 0 Posts
You can only load the 15 amp ckt to 80%, so keep your lighting--- TOTAL load to 12 amps. for this ckt.
Old 06-05-06, 07:13 PM
Speedy Petey's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Nov 2003
Posts: 2,454
Received 0 Votes on 0 Posts
Or around 1440 watts total.
Old 06-07-06, 12:50 PM
Join Date: Jun 2006
Posts: 1
Received 0 Votes on 0 Posts
Lights on a 15amp ckt

Yes,you would be safe,and the circuit will still be way under used and loaded ,if you only have lighting on it and no receptacle outlets.

A safe number of 120v residential lights on a 15amp breaker or fuse connected with 14gauge copper wire,all turned on at the same time, and not ever all on for 3 hours or more,would be the total rated wattage of each FIXTURE [not merely the presently installed bulb] added up ,then divide by 120v to check that the total current does not exceed 15amps.

A 15 amp circuit will tolerate 1800 watts [15 ,120v amps] for up to 3hrs.

Hotspots in faulty wiring connections ,and old faulty receptacles will increase the unsafety.

Residential lighting is not defined as a ‘continuous’ load [on for 3 hrs or longer] so the 80 percent rule is not an issue,as it is in commercial settings.Circuit breakers are not rated to be loaded full, for 3 hrs and longer.

If this circuit also has some 120v receptacle outlets connected ,or the lighting is all in one room, like a shop or a garage ,you may want to re-evaluate your design,and split your outlets up on different circuits ,to avoid being completely in the dark when some tool or other situation/event,causes the breaker to trip due to either an overload or a short-fault somewhere on the circuit.

Three double fluorescents will be somewhere under 1amp [120watts] each,so you have a long way to go .
Circuits for new room additions and new construction will allow some room for some small circuit extension-add ons, in the future.

Safe is one thing and the breaker helps a bunch there,but good design is another.
Being in the dark is unsafe.

Old 06-07-06, 02:09 PM
Thread Starter
Join Date: Dec 2001
Posts: 158
Received 0 Votes on 0 Posts
thanks so much...the moderatoers here are first class!!

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: