Overhead Entrance in exterior 480 volt switch gear

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djd

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The debate i am having is with my boss on whether you can enter 480 volt exterior switchgear outside from the top even with a myers hub. I have been told this is incorrect and you cannot do this if it is 480. He claims he s done this many a times with overhead service feeders which are pretty rare today especially here in San Diego county Ca. . I dont think this is NEC which I told him , that it may be local city of San Diego , Ca . I have seen it done twice and one time it was considered a mistake by one and a pretty heavy change. I think I am right and he may be to , but today and in San Diego you have to enter from the side with an adjacent pull box so I have been . My question is does anyone know where i might find a ready answer in this municipality. San Diego Ca that is.:rant::rant: I would like to see this in writing
 
djd said:
The debate i am having is with my boss on whether you can enter 480 volt exterior switchgear outside from the top even with a myers hub. I have been told this is incorrect and you cannot do this if it is 480. He claims he s done this many a times with overhead service feeders which are pretty rare today especially here in San Diego county Ca. . I dont think this is NEC which I told him , that it may be local city of San Diego , Ca . I have seen it done twice and one time it was considered a mistake by one and a pretty heavy change. I think I am right and he may be to , but today and in San Diego you have to enter from the side with an adjacent pull box so I have been . My question is does anyone know where i might find a ready answer in this municipality. San Diego Ca that is.:rant::rant: I would like to see this in writing
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If it is a city code then the electrical inspector should gladly help with that.
 
If this is a universal rule - then why do they even make 600 volt safety switches with rainproof hub assemblies?

I could see it possibly being a local rule someplace.

99.99% of the irrigation services in these parts are pole mounted 480 volts supply, from the top it goes weatherhead, raceway, meter socket, short raceway nipple, 600 volt safety switch. Both meter socket and safety switch have top entries utilized, with the typical bolt on hubs commonly found on such equipment.
 
djd

djd

kwired said:
If this is a universal rule - then why do they even make 600 volt safety switches with rainproof hub assemblies?

I could see it possibly being a local rule someplace.

99.99% of the irrigation services in these parts are pole mounted 480 volts supply, from the top it goes weatherhead, raceway, meter socket, short raceway nipple, 600 volt safety switch. Both meter socket and safety switch have top entries utilized, with the typical bolt on hubs commonly found on such equipment.
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Thats pretty much what my boss has said, i have only seen this twice , personal preference maybe ? Iam going check with the local inspector , I have become a little obsessed , Thank you for your response.
 
djd said:
Thats pretty much what my boss has said, i have only seen this twice , personal preference maybe ? Iam going check with the local inspector , I have become a little obsessed , Thank you for your response.
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There is no NEC rule prohibiting it.

There are job specifications that sometimes prohibit it.
 
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