International Association of Certified Home Inspectors
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| Inspection Question of the Day These are inspection questions posted daily by members of InterNACHI's Educational Committee. |
| View Poll Results: 4 conductors entering a mast head is typical of? | |||
| 120/240 volt supply |
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0 | 0% |
| 240 volt only supply |
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1 | 4.00% |
| 3 phase supply |
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24 | 96.00% |
| 4 phase supply |
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0 | 0% |
| Voters: 25. You may not vote on this poll | |||
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#1
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Hi to all,
here's todays question Picture courtsey Ben Kelly Regards Gerry "To realize our true destiny, we must be guided not by a myth from our past, but by a vision of our future." (Mark B Adams) Commercial property Inspection Tampa, Orlando, Sarasota, Jacksonville, Ft Launderdale, Miami, Florida. NACHI cell 484-429-5466 NACHI02121106 |
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#2
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Hi to all,
I guess that question was way too easy, the correct answer is: 3 Phase supply Regards Gerry "To realize our true destiny, we must be guided not by a myth from our past, but by a vision of our future." (Mark B Adams) Commercial property Inspection Tampa, Orlando, Sarasota, Jacksonville, Ft Launderdale, Miami, Florida. NACHI cell 484-429-5466 NACHI02121106 |
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#3
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Please Note:
jtedesco1 is a non-member guest and is in no way affiliated with InterNACHI or its members.
Gerry:
I see a smaller grounded conductor in the picture [2nd from top left] that is identified with white tape, so we should be calling this as a: 3 phase, 4 wire supply, 208Y/120 volts often called either a "Wye" or "Star" configuration. I wish I still had the link where someone posted the 2005 NEC Handbook for download, that publication would be very helpful because it gives diagrams showing these configurations. The most recent changes in the code require identification of the exposed conductors to be sunlight resistant, with the permission to use tape or sleeving when listed for that purpose by a qualified testing laboratory. PS: If this hand was extended while standing on the ground the: "drip loop" is too low, it is not allowed to be less than 10 feet in that area. |
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