Service mast height

[nizak]

Is there a maximum height above a roof before a 2” rigid riser needs to have a guy wire / additional support?

I have 42” in my head but don’t know where I got that from.

Thanks

 

[roger]

See 230.28, 342.30(A)(3) and 344.30(A)(3)

 

[kwired]

See 230.28, 342.30(A)(3) and 344.30(A)(3)

Those just tell us it doesn't need securely fastened within 3 feet of the weather head and don't mention how much riser from the last point of support is permissible. Nothing in NEC really tells us this and is up to designer, installer, AHJ and often the POCO to determine how much strain from the supported service drop may be permissible. This strain is more complicated by weight/length of the drop along with added effects from wind or possible ice build up on the line as well.

 

[roger]

Those just tell us it doesn't need securely fastened within 3 feet of the weather head and don't mention how much riser from the last point of support is permissible. Nothing in NEC really tells us this.

Exactly, why do you think I posted it?

 

[ptonsparky]

Your POCO may have requirements.

 

[AC\DC]

3’ here

 

[Seven-Delta-FortyOne]

It’s a POCO requirement, not an NEC issue.

Here in California we have to follow the “Greenbook” from PG&E, and they have several requirements and diagrams for different situations.

I don’t know where you’re at, but I would get in touch with your local poco and/or grab their code book.

I carry a green book in the van along with the CEC, as I use it so often.

 

[Little Bill]

POCO specs it here.
I deal with multiple POCO and some are different. It ranges from over 36" to over 42".

 

[AC\DC]

Doesn’t the power company have a book that they follow? Should be in that then. They keep Telling me that the NEC in their book generally coincides at least as far as like height requirements