Electrician Talk banner
1 - 19 of 19 Posts

·
Registered
Joined
·
132 Posts
Discussion Starter · #1 ·
Just wondering if the service mast from were your from needs to be 2" rigid for 100a service. I thought if it's copper you could use 1 1/4. Is this not correct anymore?
 

·
Banned
I make all the electrons line up for their Flu shots
Joined
·
33,456 Posts
It is up to the power company of your area.
 

·
I own stock in FotoMat!
Joined
·
39,117 Posts
Masts are not about raceway fill..... they're about the strength needed to support the service drop conductors as well as wind and ice loads on them.
 

·
Registered
Joined
·
106 Posts
I had to do a 3" mast for a 300 amp service once. Between the 3" pipe and the bulbous meter pan the thing looked like something for the challenger space shuttle attached to the side of the house. It should have been underground but it wasn't my call there.
 

·
Retired Account
Joined
·
39,697 Posts
I like to install pipe via strut clips to strut on larger OH services

Some of which amount to 1/2 ton of pipe/wire

because this happens when we don't>



~CS~
 

·
Registered
Joined
·
74 Posts
On Long Island we're required to install a 2 1/2 inch mast. 3 inch if it's more than 5 ft above the roofline.
 

·
:-)
Joined
·
3,670 Posts
Here we use...

1-1/4 for 18 inches above the roof
1-1/2 for 2 feet
2" for 3 feet above the roof and/or a pull of 30 meters.

then there is the 8x8x20 foot posts we bolt onto the side of a building and run a pvc up.

Edit: We don't fool with a mast. She is bolted with two 1/2 bolts to the structure. One near the meter base and one near the eave, always at least 18 inches apart. Mast bolts we call them.
 
1 - 19 of 19 Posts
Top