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January 28, 2019
Re: CQD answer published January 16, 2019 - Holiday Decorative Lighting Regarding CQD of 01/16/19: I would like to offer a different viewpoint on the topic of holiday lighting installations. I can take an unopened box of holiday lights, toss it onto the roof, leave it there for years, and I will not have created an “electrical installation.” Hanging the lights on the gutter also does not comprise an “electrical installation.” It is only when I run an extension cord or employ some other method to temporarily bring power to the lights that an “electrical installation” will have been created. It is like saying that I need and electrician and a permit in order to get receptacles installed in a new room, but I don’t need one in order to plug a lamp into one of the receptacles. Utilization equipment is not part of the premises wiring system; decorative lights are not electrical installations. Charlie Beck
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January 25, 2019
Thank you for your code insight. I am confused, (my normal state) about 250.66 requirements for grounding electrode conductor size and 250.104 for water pipe and structural steel bonding. A service fed with 5 runs of 500 KCMIL copper would require a 3/0 grounding electrode conductor to the water pipe and building steel. However, 250.104 requires a 350 KCMIL copper the water pipe and building steel. Am I confused, missing something, or merely misinformed. Thanks! Mike
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January 24, 2019
Heighth on riser brackets Mathew Colbert
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January 23, 2019
What type is wire should be used inside the core of a 13” block wall? Dave Guzofsky
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January 22, 2019
I was told today that a drilled concrete hole can be used as a raceway. They drilled through a concrete stand up wall and put a FS box on the outside and a regular 4” square and just run THHN wire through the drilled concrete hole. I’ve been doing this a long time and can’t believe this can be legal. Thanks David
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January 21, 2019
I have noticed a Romex connector to Clamp individual Unjacketed MTW rated wires in a Machine tool Control Panel. Theses conductors will carry 400 volts to and from an Inverter type Motor Drive. Is this a violation of NEC or UL508? Kurt Adlon
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January 18, 2019
Re: CQD answer published Thursday, January 10, 2018 - Continuous Loads I'd like to just comment on the CB or OCPD rating of the feeder. The ampacity is determined by the method described, 125% of the anticipated full load. The OCPD then can be selected base on that. For feeders, the standard size value for OCPD can be rounded down from that ampacity rating, not up as required for branch circuits. Best regards, Nick Abbatiello
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January 17, 2019
How is it possible to have a L-G fault on an ungrounded delta system? The delta is ungrounded (no neutral or ground), so physically speaking, how can we have a L-G fault? Thank you Fas Tef
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January 16, 2019
Can I run a class 2 circuit cable (outer sheath around insulated conductors) in same conduit as power based on 725.136(I)(2)? Thanks, Zach
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January 15, 2019
Happy Holidays to all! My neighbor does not believe me that the NEC covers Electrical Holiday Decorations. Can you please share your interpretation 590.3B, so I can kindly remind him that if he installs Holiday Lights in Late November, taking them down in July is a code violation? I really do like Frosty the Snowman, but not in the summer. — Tom Cummins (aka The Grinch)
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January 14, 2019
Re: CQD answer published Wednesday, December 26, 2018 -GFCI Neutral My money says that the 2-pole GFCI breaker will operate just fine with no grounded conductor because there are no line-to-neutral loads as stated by the original question. Remember that inside that GFCI breaker is a small current transformer. All three conductors (two hots and a not) are feed through that CT. Since all the current is flowing through just the two ungrounded conductors, no grounded conductor is needed to allow for correct function. Matthew Hermanson
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January 11, 2019
On a 100 temporary service is the neutral required to be insulated? I have been using SEU cable but the inspector red tagged. His comment was if I could show him in the code book if the neutral was not required to be insulated he would ok the service Alfred Boggess
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January 10, 2019
Clarification on a/c breaker On an air conditioner data plate. It states 35 amp Max OCPD Minimum Circuit Ampacity of 21.5 amps 1) What size OCPD is required for this equipment per Listing and Labeling 2) Am I permitted to put in a lower OCPD than the Max Listed and Labeling on the equipment. Pete Mazzagatti
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January 9, 2019
The transformer in the switchgear has an output at 480 volts of 1203 amperes. The main breaker in the gear downstream of the transformer is a 1600 Amp. With the 80% rating inherent in breakers, this 1600 amp breaker will carry 1280 amperes for continuous loads. Code defines continuous as 3 hours or more, which would apply to the machine operation we are installing. Thus the 1600 amp breaker will have a max rating of 1280 amperes. We are installing a 1000 kva transformer that max load is 1204. By code do I have to run feeders large enough for the 1600 amp breaker or can I run feeders for the 1204 amp draw. Piping directly into my transformer. With no disconnecting means at transformer. Which is 110' away in another room. Thanks for all the great stuff I learned from you. Brett
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January 8, 2019
2017 NEC code question: So I’m installing low voltage 12vac luminaire to a deck post near a pool/spa/inground hot tub. It is located little over 5 feet away from the inside wall and up 8 feet heigh. Art. 411.5 (b) says no less than 10 feet from nearest edge of pool unless permitted by article 680. So when I go to 680.22 (b)(6) it talks about within 5 feet with low voltage Luminaires. But my measurements are outside of 5 feet and 8 feet high . So when I look at 680.22 (b) 4 it looks like it just has to be rigidly attached because I’m over 5 feet heigh? I just don’t know if that means low voltage luminaries also ? What part of 680.22 does my installation fall under? Thanks Steve
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