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Old 08-16-2012, 09:25 PM   #46
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6% voltage drop for 60 amp sub panel?


Are you using 90 sweeps or 90 elbows ?




Last edited by Stubbie; 08-16-2012 at 09:28 PM.
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Old 08-16-2012, 10:10 PM   #47
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6% voltage drop for 60 amp sub panel?


You guys can use plumbing elbows? We have to follow a minimum bend radius as in pic 1
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Old 08-16-2012, 10:28 PM   #48
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6% voltage drop for 60 amp sub panel?


Do you know where I can purchase a cheap handhole box online? I couldn't find anything after brief search on google except for large $1800+ ones.

I am using the larger sweep elbows...
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Old 08-17-2012, 12:06 AM   #49
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6% voltage drop for 60 amp sub panel?


Quote:
Originally Posted by andrew79 View Post
You guys can use plumbing elbows? We have to follow a minimum bend radius as in pic 1
nope ... just making sure what he was using
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Old 08-18-2012, 04:34 PM   #50
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6% voltage drop for 60 amp sub panel?


If can keep the run at 360 degrees of bends, what size conduit for each option do you guys recommend I use to keep the pulling of wires manageable?

Option 1
(3) #4 THWN CU
(1) #8 Stranded CU Ground

Option 2
(3) #2 XHHW AL
(1) #8 Stranded CU Ground
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Old 08-18-2012, 04:46 PM   #51
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6% voltage drop for 60 amp sub panel?


1 1/2"


2"
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Old 08-18-2012, 06:04 PM   #52
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6% voltage drop for 60 amp sub panel?


Thanks!
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Old 09-02-2012, 08:24 PM   #53
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6% voltage drop for 60 amp sub panel?


Ok... So I got the conduit buried and pull string through..

If I do not wish to continue conduit run through basement into panel, can I splice on NM cable and pull this through floor joists?

If so, should I use 4/3 with ground NM cable, my THWN feeders are (3) #4 CU and (1) #8 copper?
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Old 09-02-2012, 09:09 PM   #54
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6% voltage drop for 60 amp sub panel?


Yes you can splice, but must be inside a properly sized accessible junction box
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Old 09-02-2012, 10:07 PM   #55
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6% voltage drop for 60 amp sub panel?


See if this will help you..............Wire Size Calculator...
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Old 09-02-2012, 10:50 PM   #56
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6% voltage drop for 60 amp sub panel?


Thanks guys!
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Old 10-08-2012, 09:43 AM   #57
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6% voltage drop for 60 amp sub panel?


Alright.. FINALLY getting moving on this project again....

I have the mason here and he's gonna punch a hole through the brick to install the LB in the garage wall, but I forgot to ask...

1) The ground wire from the (2) rods going into the sub panel, does this run outside the conduit from rods and come in through bottom of sub panel -or- does it run inside conduit from sub panel to LB and I drill a hole through LB at bottom to come out of here into ground rods?

2) What size solid bare ground (from rods to sub panel) should I run? I was told something about if it's #4 it doesn't need to be protected by a raceway, so that's were I'm getting confused.

Many thanks for the help!
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Old 10-08-2012, 10:49 AM   #58
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6% voltage drop for 60 amp sub panel?


Number 6 ground is sufficient. It need to be run seperate to the ground rods. Personally i would run it in its own PVC pipe for protection. There is an article on the sizing and protection but by the time I actually find it an American sparky will probably already have posted it lol.
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Old 10-08-2012, 03:08 PM   #59
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6% voltage drop for 60 amp sub panel?


Thanks andrew, hopefully someone comes along and can verify if #6 ground is required to be protected. If it is, can I use #4 without protection? About 18" would be exposed above ground.


I really did not want to run another piece of conduit and LB for the ground, the feeders LB already sticks out enough against my brick garage...lol



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Originally Posted by andrew79 View Post
Number 6 ground is sufficient. It need to be run seperate to the ground rods. Personally i would run it in its own PVC pipe for protection. There is an article on the sizing and protection but by the time I actually find it an American sparky will probably already have posted it lol.
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Old 10-08-2012, 04:12 PM   #60
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6% voltage drop for 60 amp sub panel?


250.64

(B) Securing and Protection Against Physical Damage.
Where exposed, a grounding electrode conductor or its en-
closure shall be securely fastened to the surface on which it
is carried. Grounding electrode conductors shall be permit-
ted to be installed on or through framing members. A 4
AWG or larger copper or aluminum grounding electrode
conductor shall be protected if exposed to physical damage.
A 6 AWG grounding electrode conductor that is free from
exposure to physical damage shall be permitted to be run
along the surface of the building construction without metal
covering or protection if it is securely fastened to the con-
struction; otherwise, it shall be protected in rigid metal
conduit (RMC), intermediate metal conduit (IMC), rigid
polyvinyl chloride conduit (PVC), reinforced thermosetting
resin conduit (RTRC), electrical metallic tubing (EMT), or
cable armor. Grounding electrode conductors smaller than 6
AWG shall be protected in RMC, IMC, PVC, RTRC, EMT,
or cable armor.

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