Tom - Great educational example for the multiple NEC Articles at play here! Coming from an electrical engineering background, I have learned that a picture is worth a thousand code references... or however that saying goes 😄 Answers to your questions throughout the video: Q: 23:40 - What Section of the Code explains how many threads of a screw need to be engaged for a bond? A: NEC 250.8 Connection of Grounding and Bonding Equipment - Not less than two threads or secured with a nut (depending on screw type) Q: 36:10 - What Section in Article 250 relates to Objectionable Current on Equipment Grounding Conductor? A: NEC 250.6 Objectionable Current
I think I would have made the secondary sealtite a little longer and strapped it to the transformer pad as I would be afraid of some building maintenance guy stepping on it . Also, the pipe with LB out of the right end of the gutter should be supported some how (maybe its not complete) .
Hi Tom, your right this is phenomenal stuff.. Question for you when you were sizing the secondary OCP you used 175%, and went to the next size up OCP. Could you please tell me so that I know where you found 175%. I checked the 450.3(B) table and did not see it. Please help me understand this better.
250.104(D)1 and 2. Separately derviced system must be grounded to metal water pipe and structural steel. No requirement for ground rods needed and in fact is not providing a effective return path and should be removed immediately.
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Tom - Great educational example for the multiple NEC Articles at play here! Coming from an electrical engineering background, I have learned that a picture is worth a thousand code references... or however that saying goes 😄
Answers to your questions throughout the video:
Q: 23:40 - What Section of the Code explains how many threads of a screw need to be engaged for a bond?
A: NEC 250.8 Connection of Grounding and Bonding Equipment - Not less than two threads or secured with a nut (depending on screw type)
Q: 36:10 - What Section in Article 250 relates to Objectionable Current on Equipment Grounding Conductor?
A: NEC 250.6 Objectionable Current
Thanks for bringing the code to the real world and interfacing it with this install. Good examples. A lot of AHA moments.
Tom nice job Robert from Omaha
Great to see you here in Sioux Falls
I think I would have made the secondary sealtite a little longer and strapped it to the transformer pad as I would be afraid of some building maintenance guy stepping on it . Also, the pipe with LB out of the right end of the gutter should be supported some how (maybe its not complete) .
Please keep this content up! GOLD
Just great stuff Tom. Thanks.
Educational 👍
Great stuff
At the 42 minute point should there be the bonding of the neutral at the first disconnect since it a new (separately derived) system
Can you explain why on calc. the fault current on secondary that you divided voltage by z% ?
Hi Tom, your right this is phenomenal stuff..
Question for you when you were sizing the secondary OCP you used 175%, and went to the next size up OCP. Could you please tell me so that I know where you found 175%. I checked the 450.3(B) table and did not see it. Please help me understand this better.
Amazing
nice content
250.104(D)1 and 2. Separately derviced system must be grounded to metal water pipe and structural steel. No requirement for ground rods needed and in fact is not providing a effective return path and should be removed immediately.