Need Help
- Thread starter bkg
- Start date
- Status
- Location
- Massachusetts
Re: Need Help
What is the total load on the circuit?
If these are older 4 lamp T-12 fixtures @ 120 volts that is a maxed out circuit.
What do you consider excessive heating?
Warm is not bad.
What is the total load on the circuit?
If these are older 4 lamp T-12 fixtures @ 120 volts that is a maxed out circuit.
What do you consider excessive heating?
Warm is not bad.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Need Help
BKG-look at the ballast amps, multiply by 2 per fixure and x 12 fixtures. The limit for a 20 amp ckt is 80% or 16 amps. You have to take the ballast amps as it includes the losses in the ballast. An easy fix is to replace the ballasts with T-8's and new lamps.
BKG-look at the ballast amps, multiply by 2 per fixure and x 12 fixtures. The limit for a 20 amp ckt is 80% or 16 amps. You have to take the ballast amps as it includes the losses in the ballast. An easy fix is to replace the ballasts with T-8's and new lamps.
Re: Need Help
Well that would explain where I mis-calculated...
.75 amp per ballast puts me at 18 amps.There are actually 3 circuits like this. I'm thinking perhaps pulling 2 lights off each circuit and running a 4th circuit of 6. Have to change out the boxes,add wire, 1/2 day. Ahh*#$@ :roll:
Thanks for the help... any idea what a T8 ballast runs ( $$ ) these days?
Well that would explain where I mis-calculated...
.75 amp per ballast puts me at 18 amps.There are actually 3 circuits like this. I'm thinking perhaps pulling 2 lights off each circuit and running a 4th circuit of 6. Have to change out the boxes,add wire, 1/2 day. Ahh*#$@ :roll:
Thanks for the help... any idea what a T8 ballast runs ( $$ ) these days?
luke warmwater
Senior Member
Re: Need Help
just paid 20.75 for each Advance 4P32SC35I electronic ballast. That was not a quantity price.
1.32 for each GE F34CW T-8 lamp. Non-quantity price also.
just paid 20.75 for each Advance 4P32SC35I electronic ballast. That was not a quantity price.
1.32 for each GE F34CW T-8 lamp. Non-quantity price also.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Need Help
In some states (as in Washington) the use of T-8 & electronic ballasts is required by an energy code. However, I can get a rebate from our POCO on a retrofit, and you energy savings will give you a pretty good payback, plus the light quality is better (3500 deg K or higher) and there is no lamp flicker.
In some states (as in Washington) the use of T-8 & electronic ballasts is required by an energy code. However, I can get a rebate from our POCO on a retrofit, and you energy savings will give you a pretty good payback, plus the light quality is better (3500 deg K or higher) and there is no lamp flicker.
jafro
Member
- Location
- Fort Saskatchewan, Alberta, Canada
Re: Need Help
Remember if you install new electronic ballast and T8 lamps that they are now not listed. They must be re-certified
Jafro
Remember if you install new electronic ballast and T8 lamps that they are now not listed. They must be re-certified
Jafro
- Status