MECKLENBURG COUNTY. Land Use and Environmental Service Agency Code Enforcement 8/10/11 ELECTRICAL CONSISTENCY MEETING. Code Consistency Questions
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1 MECKLENBURG COUNTY Land Use and Environmental Service Agency Code Enforcement 8/10/11 ELECTRICAL CONSISTENCY MEETING Code Consistency Questions 1. Is low voltage cable allowed to be run through drilled holes in wood studs along with normal 15 and 20 amp branch circuits in a single family dwelling? Maybe and Yes. Per there are many instances where the two are not allowed to be run together; however at (I) it states: I) Other Applications. For other applications, conductors of Class 2 and Class 3 circuits shall be separated by at least 50 mm (2 in.) from conductors of any electric light, power, Class 1 non power-limited fire alarm or medium power network-powered broadband communications circuits unless one of the following conditions is met: (1) Either (a) all of the electric light, power, Class 1, non power-limited fire alarm and medium-power network-powered broadband communications circuit conductors or (b) all of the Class 2 and Class 3 circuit conductors are in a raceway or in metal-sheathed, metal-clad, non metallic-sheathed, or Type UF cables. (2) All of the electric light, power, Class 1 non power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors are permanently separated from all of the Class 2 and Class 3 circuit conductors by a continuous and firmly fixed nonconductor, such as porcelain tubes or flexible tubing, in addition to the insulation on the conductors. 2. I ran a 50a circuit to a wall mounted oven and tapped a #10 to feed a counter-mounted cooking unit. The inspector turned me down and said this was only for the factory leads that came with the oven. Is this correct? Per NEC Article (A)(3). This is not totally correct. 700 North Tryon Street Charlotte, North Carolina Phone (704) Fax (704)
2 Page 2 of (A)(3) covers factory-installed and field-installed tap conductors. The supply conductors included in a factory-installed pigtail are considered to be tap conductors in applying this exception. As illustrated below, this exception permits a 20-ampere tap conductor from a range, oven, or cooking unit to be connected to a 50-ampere branch circuit if the following four conditions are met: 1. The taps are not longer than necessary to service or permit access to the junction box. 2. The taps to each unit are properly spliced. 3. The junction box is adjacent to each unit. 4. The taps are of sufficient size for the load to be served. 3. Is a ground rod required to be driven when a generator is installed to feed a building as a NON-separately derived system? What if it s a separately derived system. No, Yes. (See Attached) System Bonding Jumper (A)(1)
3 Page 3 of 5 Connects the equipment grounding conductors of the derived system to the grounded conductor of the derived system. The system bonding jumper is sized in accordance with (A) through (D) based on the size of the derived phase conductors. Sized per Table or 12½% rule if derived phase conductors exceed the values in Table Locate system bonding jumper inside source enclosure or at any point to and including the first disconnecting means or OC device of the system The point of connection shall be made at the same point as the grounding electrode conductor connection to the system 4. During an inspection of a new restaurant located in a mall, there is a shaft for rooftop equipment and there is no way to enter the shaft for installation of raceways. The contractor wants to install five runs of ½ flexible metal conduit with a maximum of four # 12 AWG conductors. Section (A) Exception permits flex to be unsupported where fished. Do product standards limit the maximum weight a flex connector can withstand and is this installation permitted? If permitted is there a maximum vertical length flex can be fished? It appears that the language in (A) does permit FMC to be unsecured and unsupported when fished. Also unless the shaft is one of the areas not permitted by and it appears it is not, then the NEC would permit it. There are rules for conductor support in The UL white book PG 115 does not address the pull out requirements however; UL 514B requires a 50 lbs pull for 5 minutes for FMC connectors. To me, this is a classic decision for the AHJ on site. I don't believe that the CMP intended the unsupported length to be open ended. In response to your FMC question, the UL pullout requirement for the 1/2 size is 75 lbs. I would think that the length of the run would be a major consideration for this installation. Obviously the longer the run the more weight the connector would have to contend with. 5. At a 4-story hotel, we are installing 480-volt feeders up to each floor and the design calls for the grounding electrode conductor for the transformers to be installed in the power wiring conduit that feeds into the transformer disconnect at each floor. The bonding is done in the transformer. The building is poured concrete so the grounding electrode system consists of the underground water piping and the concrete encased electrode. The power wiring is installed in PVC conduit with an equipment-grounding conductor. Doesn t the NEC require the GEC to be run separately? No, as long as all the applicable Code rules are followed. For the raceway aspect that is the majority of the question, section (B) covers this. The grounding electrode conductor
4 Page 4 of 5 can be installed in the power conduit, in a separate conduit where physical protection is required or open where protection from physical damage is not necessary. If any of the raceway parts or enclosures are ferrous metal then those parts must be bonded at the entry and exit to the grounding electrode conductor per (E). The other key part is terminations. The question states the connection is in the transformer and that is fine, but the connection where the feeder originates has to be considered. To meet the definition in Article 100 and section the end of the grounding electrode conductor at the beginning of the feeder must be connected directly to a grounding electrode or to a common grounding electrode conductor by one of the connection means specified in I need to supply four 40-amp, 3-phase, 120/208 receptacles. These receptacles are all adjacent to one another but the supply panel is quite some distance away. There is an existing unused 90-amp (#4's & #8 ground) set of conductors less than 10 ft. from the proposed new receptacles. The nameplate ampacity rating for each appliance is 25 amps (ovens). Am I correct in understanding that the 10 ft. tap rule can be used to supply the new receptacles provided that the tap conductor s ampacity is not less than the combined calculated loads of the tap feeder? If the tap conductors are individually routed properly, do I need to provide an additional disconnecting means for these individual openings other than the receptacles themselves? These commercial ovens are considered to be non-continuous loads. The installation method in this question does not meet NEC compliance. If the following code sections are adhered to however, this installation is possible (A) [Specific Appliances or Loads] requires the branch circuit loading to be calculated based on the equipment rating. In this case the branch circuit would need to be rated for 100 amperes 25 amps) not 90 amperes and (A)(4) require the branch circuit conductors to have an ampacity not less than the maximum load served for non continuous loads. Receptacles (not outlets) are mentioned in the question, so I m assuming the ovens are cord and plug connected and also portable. Section (A)(2) requires the conductors serving more than one receptacle to have a rating not less than the rating of the branch circuit.
5 Page 5 of 5 7. I ran a raceway (tucked in a corner) up the entire length of a stairwell in a five-story building. The raceway was for some new signs on the outside of the building. The Building Inspector red-tagged it without leaving any explanation. Is this a violation of the NEC? If not, what code is it from? NO. Not an NEC violation. However there are many instances when the applicable building codes prevail. Building codes do not allow anything in stairwell shaft enclosures unless they are related to the stairwell. Example lighting, Fire Alarm etc. In the ICC building code sections are Prohibited penetrations. Penetrations other than those necessary for the purpose of the shaft shall not be permitted in shaft enclosures 8. We have quite a bit of abandoned low-voltage communication cable in our facilities. Where are the requirements in the NEC to remove this cable? When do cables have to be removed? As a general rule, where the majority of the ceiling tiles are removed or replaced during the project that portion of the ceiling shall have all abandoned cables removed and / or supported and tagged for future use. The remaining cables shall be properly supported. Section 640.3(A) for Audio Cable, Section 645.5(D)(6) for cables in Information Technology Equipment spaces, Section 725.3(B) for Class 2 & 3 Circuits, Section 760.3(A) for Fire Alarm Cables, Sections 770.3(A), (A) & (B)(1) for Optical Fiber Cables and Raceways, Sections 800.3(C), (A) & (B)(1) for Communications Circuits, Sections 820.3(A), (A) and (B)(1) & (D) for CATV systems, Section 830.3(A) for Network-powered Broadband cables. 9. If service drop conductors are increased in size due to voltage drop, is it required to increase the size of the grounding electrode conductor? No, it must be sized based on the SE conductors not the service drop conductors.
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