Uncle_D
New Member
I am building a 10x20 ft produce shed. Will clean and sort produce in there. One end will have a 6x10 ft walk-in cooler. Shed will be 40 feet from the house. I plan on running 6-3 NM-B cable inside PVC conduit. 35ft in crawlspace under house. 40 ft underground to shed. The total run panel to subpanel will be 90ft or less. I will install a 60amp breaker in the house main panel (200amp service panel) to feed this circuit. In the shed I want to install a 12 circuit main lug panel.
1st circuit 110V 20amp for A/C cooler unit. 2nd circuit 110V 20amp for shed A/C unit. Then two or three 110V utility circuits. Then another 110V circuit for outlets on the outside of the produce shed. I will put in two grounding rods at the shed for the main lug panel grounding. I will keep the ground and neutral in the shed subpanel separate.
I’ve read that I can NOT install NM cable inside conduit in the ground. I must use separate runs of 6ga wire (for 60amp) for the two hots and neutral. Then I can use 1 strand of 10 ga for the ground. I can purchase the 6-3 NM-B (with ground) for $2.00 per foot. The single strands of 6ga cost 75cents per foot (each strand). Plus 55 cents per foot for the 10ga bare copper ground. That is $2.80 per foot to run the single strands.
1st question: Why can’t I use the cheaper 6-3 NM-B cable which actually has more insulation than the single strands of 6ga wires? Can I get these single strands in black, red and white?
2nd question: Any code problem with using the 12 circuit main lug box in the shed?
I live in Tennessee. In the very rural country. No city inspectors. But, I want to be safe and up to NEC code.
Thanks for any help.
Uncle_D
1st circuit 110V 20amp for A/C cooler unit. 2nd circuit 110V 20amp for shed A/C unit. Then two or three 110V utility circuits. Then another 110V circuit for outlets on the outside of the produce shed. I will put in two grounding rods at the shed for the main lug panel grounding. I will keep the ground and neutral in the shed subpanel separate.
I’ve read that I can NOT install NM cable inside conduit in the ground. I must use separate runs of 6ga wire (for 60amp) for the two hots and neutral. Then I can use 1 strand of 10 ga for the ground. I can purchase the 6-3 NM-B (with ground) for $2.00 per foot. The single strands of 6ga cost 75cents per foot (each strand). Plus 55 cents per foot for the 10ga bare copper ground. That is $2.80 per foot to run the single strands.
1st question: Why can’t I use the cheaper 6-3 NM-B cable which actually has more insulation than the single strands of 6ga wires? Can I get these single strands in black, red and white?
2nd question: Any code problem with using the 12 circuit main lug box in the shed?
I live in Tennessee. In the very rural country. No city inspectors. But, I want to be safe and up to NEC code.
Thanks for any help.
Uncle_D