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Joe Tedesco

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    NEC Instructor since 1969

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  1. 312.8 Enclosures for Switches or Overcurrent Devices. Enclosures for switches or overcurrent devices shall not be used as junction boxes, auxiliary gutters, or raceways for conductors feeding through or tapping off to other switches or overcurrent devices, unless adequate space for this purpose is provided. The conductors shall not fill the wiring space at any cross section to more than 40 percent of the cross-sectional area of the space, and the conductors, splices, and taps shall not fill the wiring space at any cross section to more than 75 percent of the cross-sectional area of that space.
  2. UL Standard for Safety for Electric Clothes Dryers, UL 2158 23.12 Overcurrent protection 23.12.1 If an appliance is intended to be connected to a branch circuit rated more than 30 A, overcurrent protection shall be provided for the control circuits. Download Attachment: Pages from 2009 White Book Final.pdf 63.45 KB
  3. 210.3 Rating. Branch circuits recognized by this article shall be rated in accordance with the maximum permitted ampere rating or setting of the overcurrent device. The rating for other than individual branch circuits shall be 15, 20, 30, 40, and 50 amperes. Where conductors of higher ampacity are used for any reason, the ampere rating or setting of the specified overcurrent device shall determine the circuit rating. 220.54 Electric Clothes Dryers — Dwelling Unit(s). The load for household electric clothes dryers in a dwelling unit(s) shall be either 5000 watts (volt-amperes) or the nameplate rating, whichever is larger, for each dryer served.
  4. Gentlemen: Please see Section 210.3 for branch circuit ratings, and Section 220.54 for Electric Clothes Dryers — Dwelling Unit(s). Question: Was the dryer cord and plug connected? If so, that cord cap and receptacle should be rated at 30 amperes which is typical for that type of equipment. I have discovered where an electric range was installed and protected by the circuit you describe; and where that range was replaced with the electric dryer. Just another item to check. Also, I recall at some terminations where they call for copper only so that would be another item to check, or verify AL/CU identification at the lugs.
  5. Click to Enlarge 51.5 KB You hit the nail on the head! This wiring was done by persons who were not electricians and who were given strict orders by their leaders to "get it done" anyway they could. [:-thumbd]
  6. Click to Enlarge 52.43 KB People in this occupancy are subjected to very serious hazards that can lead to the loss of life by fire, or electric shock! Where do we start here and why is this allowed to remain? [:-monkeyd
  7. Courtesy NFPA NECH Article 320 III. Construction Specifications 320.100 Construction. Type AC cable shall have an armor of flexible metal tape and shall have an internal bonding strip of copper or aluminum in intimate contact with the armor for its entire length. The armor of Type AC cable is recognized as an equipment grounding conductor by 250.118. The required internal bonding strip can be simply cut off at the termination of the armored cable, or it can be bent back on the armor. It is not necessary to connect it to an equipment grounding terminal. It reduces the inductive reactance of the spiral armor and increases the armor's effectiveness as an equipment ground. Many installers use this strip to help prevent the insulating (anti-short) bushing required by 320.40 (the “red headâ€
  8. Here's a technical bulletin from New Hampshire. That department is one of the finest on the east coast! Download Attachment: .pdf"] Technical_Bulletin_on_Concrete_Encased_Electrodes[1].pdf 369.84 KB
  9. Sirs: OK, we inspected a few distribution systems yesterday and when the amprobe was used found readings that varied around 20-40 amps; and when disconnected and measured the voltage readings were never greater than 4 volts. The Main Bonding Jumper was a busbar and showed zero amps! We had to stop because the temperature was over 115 degrees yesterday! http://www.timeanddate.com/worldclock/city.html?n=27
  10. If you did eat it you would get frog legs too! [:-crazy][:-bigmout
  11. This is a condition that is common in a place where there was only sand in the desert and cities that were blown apart by rockets and mortars. Disclaimer: I must stay under the wire for now, so please allow me to continue from time to time with some of the electrical situations encountered on a daily basis. I will say that this place really seperates the men and women from the boys and girls for sure! You have got to have some serious electrical experience; and this place is not a place for crack heads and those who puff stuff while writing posts on boards like this one! I better stop because I don't want to be banned from this place too! PS: Lunch anyone? Click to Enlarge 922.12 KB
  12. Jeff: You ask lots of good questions, and this is not in the USA. I am schedulted to go out into the field tommorrow and look into this situation in more detail. It gets really tricky and sometimes has flavors of the NEC, and in others the British Standards. I will keep you posted. What I was looking for is to have someone who will use their amprobe and check the GEC and MBJ to see what their readings show.
  13. Jeff: Yes it shows amperage, and there is no cathodic protection on this system which is supplied by a 50 hz generator. There are lots on Nonlinear Loads (See definition in the NEC) on the distribution here. Reading between the connections when disconnected shows less than 2 volts. The photo is out of focus but it does show the reading.
  14. Bump! Hello Boston I will see you soon! I have many old electrical books in my library that may need a new home soon, collected during the last 35 years. Send me an email if you are interested.
  15. How would this reading affect your decisions related to 250.6 in the NEC that covers Objectionable Current? id="left"> Can you show any similar readings; or have you encountered any similar readings on any system conductors other than phases and on grounded conductors or neutrals, bonding and equipment grounding conductors?id="left"> Click to Enlarge 50.21 KB Thanks for your professional opinions!
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