Will a MV bulb "cycle" on and off ? Customer called saying it will stay on for an hour or so, turn off, then re light. My guess is either lamp or ballast, which would be the most likely? BTW owner says lamp is about 5-6 years old. Thanks.
I live down the street from what I know (is from what the newspaper said) was the most expensive intersection of I-85. I beleive there's HPS not MV but everything was wired in 1/2 PVC and it looks like one circuit(fine I'll give you two circuits)! How can 8 per side and a spared circuit raceway to the other side handle all that voltage?
This is an underpass!
When I go thru routinely two lights maybe three on side are lite, on the other side one will re-light since I'm there? I watched as the they installed it and pondered it all... Did they install it right? Well who am I to say, is it right, I'll say no!
And on page 29 it saysClick here for a TS guide.
Dennis,
I don't think that ballasts of that type have thermal protectors. At least I have never seen one that did.
I know that with HPS and MH types of lamps that the cycling of the lamp is a sign of lamp failure. Not sure about MV, but I think it is the same.
And on page 29 it says
"Normal end of life indications are . . .lamps cycling off and on."
The "hourly" time frame is coming from a homeowner, I guess i can take that for what it's worth.I will need a lift or bucket truck to get to the fixture to replace, changing the lamp can be accomplished with a 28' ext ladder and spotter on the ground. I will try the lamp first and see if that solves the problem. Really should not even get involved, elderly couple(parents friends)who will most likely go into corronary arrest if I have to tell them it's a $300 bill for lift, fixture and labor to replace it. Thanks.
The "hourly" time frame is coming from a homeowner, I guess i can take that for what it's worth.I will need a lift or bucket truck to get to the fixture to replace, changing the lamp can be accomplished with a 28' ext ladder and spotter on the ground. I will try the lamp first and see if that solves the problem. Really should not even get involved, elderly couple(parents friends)who will most likely go into corronary arrest if I have to tell them it's a $300 bill for lift, fixture and labor to replace it. Thanks.
You need safety belt like linemen use or fall arrest harness and a positioning strap and you can change the fixture from the ladder. I have probably done hundreds of them that way and all by myself. Tie equipment to a rope and hoist it up when you need it. A helper on the ground does help from needing multiple trips up and down the ladder. This allows you use the positioning strap to hold you in place freeing up both hands to work with. Or you could use pole climbing spikes that linemen use. I don't recommend that without some formal training on how to use them. It is not as simple as it looks.
A lineman school in NE recentlyhad a trainee die from a fall while learning this pole climbing skill. We have done it from a ladder for years but more & more I start looking for a bucket truck.