Subject :LED Retro fit light bulbs.
Two different fixtures.
1. Standard 2' X 4' light fixture, surface or drop ceiling mounted. 2 ,3 or 4 bulbs using bi pin.
a. T 12 older fixture requires removing ballast and possibly changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
b. T 8 new style fixture may or may not removing ballast and changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
c. T 5 (have seen this yet, but it must becoming sooner or later.)
2. Standard 2 'X 2' light fixture surface or drop ceiling mounted. 2 ,3 or bulbs using bi pin.
a. T 12 older fixture requires removing ballast and possibly changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
b. T 8 new style fixture requires removing ballast and changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
Important notes: Fixtures are using a ballast may be electronic or magnetic , (This limits current in the circuit.) The fixture was tested and approved by the UL with a ballast installed.
Does removing the ballast negate the UL listing for the fixture ? Can this be done with out manufactures approval ? Should this new retro fixture be retested by UL ?
LED Bulb manufacture is requesting the removal of the ballast (T-12 fixtures mandatory, T-8 optional ) .
If circuit is 277 Volts AC a short in this wiring (not buffered by Ballast) may open a GFCI relay pick up in a substation draw out breaker before the local 20 amp circuit breaker opens in the distribution panel.
Wiring ( not sure 18 awg or 20 awg) in lighting fixtures and pin sockets are now on line voltage . Is the wiring and pin sockets rated for line voltage ? Will they fail prior to over current 20 amp CB opening ?
Should a inline fuse by used in the fixture (after the quick disconnect) to protect the fixture wiring and pin sockets ? If so what size ?
Ears open
Cheers
Thomas
Two different fixtures.
1. Standard 2' X 4' light fixture, surface or drop ceiling mounted. 2 ,3 or 4 bulbs using bi pin.
a. T 12 older fixture requires removing ballast and possibly changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
b. T 8 new style fixture may or may not removing ballast and changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
c. T 5 (have seen this yet, but it must becoming sooner or later.)
2. Standard 2 'X 2' light fixture surface or drop ceiling mounted. 2 ,3 or bulbs using bi pin.
a. T 12 older fixture requires removing ballast and possibly changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
b. T 8 new style fixture requires removing ballast and changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
Important notes: Fixtures are using a ballast may be electronic or magnetic , (This limits current in the circuit.) The fixture was tested and approved by the UL with a ballast installed.
Does removing the ballast negate the UL listing for the fixture ? Can this be done with out manufactures approval ? Should this new retro fixture be retested by UL ?
LED Bulb manufacture is requesting the removal of the ballast (T-12 fixtures mandatory, T-8 optional ) .
If circuit is 277 Volts AC a short in this wiring (not buffered by Ballast) may open a GFCI relay pick up in a substation draw out breaker before the local 20 amp circuit breaker opens in the distribution panel.
Wiring ( not sure 18 awg or 20 awg) in lighting fixtures and pin sockets are now on line voltage . Is the wiring and pin sockets rated for line voltage ? Will they fail prior to over current 20 amp CB opening ?
Should a inline fuse by used in the fixture (after the quick disconnect) to protect the fixture wiring and pin sockets ? If so what size ?
Ears open
Cheers
Thomas
