Light Poles in a classified location

[donburde]

I have a light pole in a class 1 div 2 location. The conduit that feeds the light pole stubs up from underground and directly into the bottom of the light pole. Although the light pole is sitting in a classified location, does the conduit need to be sealed INSIDE of the light pole? Also, am I allowed to have any splices in the handhole of the pole which is 18" above ground? the C1D2 location is from the ground up to 15', the light pole is 30' tall. Thank for your help. :?

 

[petersonra]

Where boundary seals are required is fairly well spelled out.

501.15 (B)(2)

I would look closely at exception 4.

 

[BPoindexter]

The splices are not an issue in C1D2. I assume that you mean the conduit stub up into the pole? If it goes back to an unclassified location then a boundary seal would be required on the stub up as far as I know. What type of facility is it- gas station, refinery, storage tanks, etc?

 

[dicklaxt]

Thats kind of unusual for the DIV 2 to be 15 foot above grade,do you have an Area Classification drawing that depicts that? Whats the group.............

You may have a tricky situation with 2 area classification changes ,one at grade and another within the pole,,,,,,,better get an API 500 publication if the drawing doesn't cover it or force the Engineering Company to come up with an answer.



dick

 

[dicklaxt]

If you are ducking back underground and continuing on to another pole use a Cooper C-H GUAG (or equal)fitting and yes you must seal within 18 inches of the stub up.

dick

 

[dicklaxt]

I really can't remember the finer points of floodlight installation. I know I've been there on several occasions............
dick

 

[dicklaxt]

I've been setting here for the last hour drinking coffee and thinking about past installations and it seems I remember specifying that SO Cord be used within the pole but not sure about that either.I remember a recent post about concealed cord not being permissable but I can't find that code reference to see if there was an exception for poles,,anyone know the Article? They say that the memory is the 1st to go,don't believe that there are more important things.

dick

 

[BPoindexter]

Thats kind of unusual for the DIV 2 to be 15 foot above grade,do you have an Area Classification drawing that depicts that? Whats the group.............

You may have a tricky situation with 2 area classification changes ,one at grade and another within the pole,,,,,,,better get an API 500 publication if the drawing doesn't cover it or force the Engineering Company to come up with an answer.



dick

Actually in Refineries is is very common to have C1D2 to heights even greater than 15 ft. We have areas that are C1D2 up to 50ft above grade. This is because if there is a release due to a pump seal going bad etc the vapor cloud can reach that high at LEL levels. Also you have to watch where the light is placed as if it is within a certain distance of a point on a column this could be C1D2 as well.

 

[kwired]

I have a light pole in a class 1 div 2 location. The conduit that feeds the light pole stubs up from underground and directly into the bottom of the light pole. Although the light pole is sitting in a classified location, does the conduit need to be sealed INSIDE of the light pole? Also, am I allowed to have any splices in the handhole of the pole which is 18" above ground? the C1D2 location is from the ground up to 15', the light pole is 30' tall. Thank for your help. :?

Done this many times before at fuel dispensing stations. Metal pole supporting canopy is right next to fuel dispensers, so the base is in classified location. Sealoffs installed in handhole inside pole above 18" and everything above was unclassified. Haven't done one for some time now but that used to pass here. I guess I do question whether or not just the first 18" inches or the entire interior of the pole is a classified area. Might depend on if there is free air flow through the pole or if it is fairly well sealed up.

 

[dicklaxt]

Actually in Refineries is is very common to have C1D2 to heights even greater than 15 ft. We have areas that are C1D2 up to 50ft above grade. This is because if there is a release due to a pump seal going bad etc the vapor cloud can reach that high at LEL levels. Also you have to watch where the light is placed as if it is within a certain distance of a point on a column this could be C1D2 as well.

Yes,I am familiar
with that but 15 foot above grade is an odd number thats why I asked what the group was.I was going to see what API RP 500 said,,,,,,,,,,,,

dick

 

[donburde]

Sorry it took me so long to reply to all these posts... the reason the area was classified up to 15' was that it is at a compressed natural gas station. The fueling posts were 10' tall and the engineer called for a 5' radius around and above the posts. I ended up getting the GC to allow me to move one of the filling posts so it moved my light pole out of the class 1 div 2 classified area so I didn't have to worry about sealing anything on or around the light pole. Thanks for all your replies!!!