maximum number of lights


Old 06-05-06, 07:55 PM
Thread Starter
Join Date: Dec 2001
Posts: 158
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?

Sponsored Links
Old 06-05-06, 08:02 PM
pgtek's Avatar
Join Date: Oct 2004
Location: north Carolina
Posts: 1,391
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, 08:04 PM
Banned. Rule And/Or Policy Violation
Join Date: Feb 2006
Location: North of Boston, MA.
Posts: 2,113
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, 08:13 PM
Speedy Petey's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Nov 2003
Posts: 2,455
Or around 1440 watts total.
Old 06-07-06, 01:50 PM
Join Date: Jun 2006
Posts: 1
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, 03:09 PM
Thread Starter
Join Date: Dec 2001
Posts: 158
thanks so much...the moderatoers here are first class!!

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes