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Old 08-04-2012, 10:19 AM   #1
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ont code question


when a service drop runs over a roof what is the clearence height for the drop
tks keith
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Old 08-04-2012, 10:39 AM   #2
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230.24 Clearances

Service-drop conductors must be located so that they are not readily accessible, and they must comply with the following clearance requirements:
(A) Above Roofs. Overhead service conductors must maintain a minimum clearance of 8 ft above the surface of a roof for a minimum distance of 3 ft in all directions from the edge of the roof.

Exception No. 2: Where the voltage does not exceed 300V between conductors, overhead conductor clearances from the roof can be reduced from 8 ft to 3 ft, if the slope of the roof exceeds 4 in. in 12 in.

Exception No. 3: If the voltage between conductors does not exceed 300V, the conductor clearance over the roof overhang can be reduced from 8 ft to 1.5 ft, if no more than 6 ft of overhead conductors pass over no more than 4 ft of roof overhang, and the conductors terminate at a through-the-roof raceway or approved support. Figure 230-10 230-24Ax3.cdr

Exception No. 4: The 3 ft vertical clearance that extends from the roof does not apply when the point of attachment is on the side of the building below the roof.



{Side Note} Check with your local utility as they may have different requirements
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Old 08-04-2012, 10:46 AM   #3
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ont code question


He in ontario Canada stickboy. I'll go get my code book in a second.
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Old 08-04-2012, 10:47 AM   #4
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Originally Posted by andrew79 View Post
He in ontario Canada stickboy. I'll go get my code book in a second.
Ah crap.... I always forget to look at OP's location...
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Old 08-04-2012, 11:17 AM   #5
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ont code question


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Originally Posted by stickboy1375 View Post
Ah crap.... I always forget to look at OP's location...
he didn't have one, it was a shortform in the title of the thread. Would be easy to mistake, there's also an ontario in california so i could be wrong but here's the cec rule.

first off contact the power company, they'll tell you what pole the service is coming from and that will dictate where you have to put your service mast.
the cap has to located between 6 and 12 inches above the line insulator.
Snowfall needs to be taken into account, check with your local inspector.
point of attachment has to be minimum 14.8feet(4.5m) maximum 29.5feet(9m)
cannot be within 1m (39.4inches) of a window, door, or porch. Same clearance goes for the conductors.
min height of drip loops above roof is 24 inches
max height of line insulator above roof is 36inches and 59 inches above ubolt holding service mast.
750mm cable must be left out of the mast head for hydro to make their connections
and the million dollar question
12-312 Conductors over buildings
Conductors shall not be installed over buildings unless a deviation has been allowed in accordance with
Rule 2-030.
and rule 2-030 states
2-030 Deviation or postponement
In any case where deviation or postponement of these Rules and regulations is necessary, special permission shall
be obtained before proceeding with the work, but this special permission shall apply only to the particular
installation for which it is given.

which means basically that firemen need ready and full access to the roof. You can't cross more than an overhang of a roof without special permission from the inspector.
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Old 08-04-2012, 11:18 AM   #6
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he didn't have one, it was a shortform in the title of the thread.
Bwahhhh... I thought that was a typo for "ONE" code question....
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Old 08-04-2012, 11:26 AM   #7
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i'm not sure why he wants to know, the power company does all that, we just put in the mast where they tell us and leave the 750mm or wire hanging out of it.
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Old 08-04-2012, 11:28 AM   #8
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i'm not sure why he wants to know, the power company does all that, we just put in the mast where they tell us and leave the 750mm or wire hanging out of it.
Same here, BUT... sometimes people put new structures under existing installations...
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Old 08-05-2012, 08:20 AM   #9
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i guess i wasnt clear in my original post. i am in ont canada. i built a shed under the service wires that have only five feet of clearence. the line voltage is 240v. now i may upgrade the service and want to know if that clearence is sufficient by code
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Old 08-05-2012, 08:26 AM   #10
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ont code question


Judging by this response by Andrew...

Quote:
You can't cross more than an overhang of a roof without special permission from the inspector.
I would say you are going to have an issue.
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Old 08-05-2012, 10:39 AM   #11
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call the inspector, he'll tell you if it's ok, i know that when crossing sundecks and carports you have to have 8.2feet clearance but i don't see anything there for sheds. One phone call or email to esa will tell you everything you need to know.
here's a link to the question form website.
http://esasafe.com/Corporate/con_001.php
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