Author Topic: CFL wiring  (Read 2550 times)

0 Members and 1 Guest are viewing this topic.


  • Newbie
  • *
  • Posts: 5
  • Country: us
CFL wiring
« on: April 19, 2013, 01:27:29 AM »
I found a site with 24v and 12v cfl's

how many 24 volt, 15-20 watt cfls (.7 amp avg per bulb) can I put at the end of a 25 foot 12/2 romex wire and what size car fuse should the wire be connected to?
same question for 10 feet and 15 feet
does a 20 amp car fuse work for 20 amp in 24 volts also??


  • SuperHero Member
  • ******
  • Posts: 2291
Re: CFL wiring
« Reply #1 on: April 19, 2013, 02:48:40 PM »
Common automobile fuses are rates 32v, so they work in cars and trucks. A 12v nominal car voltage may be 14.5v plus depending on the alternator, so a truck alternator would be almost 30v under some circumstances, hence the 32v rating.

How many lights you can string depends on the power factor of the complete fixture.

Also, car fuses are fast blow. If you switch all the lights on at once the surge will be much higher than the operating current.

A Turnigy power meter measures peaks, so it would tell you the peak current required to start.
« Last Edit: April 19, 2013, 02:57:48 PM by dnix71 »