Electrical

Electrical Questions? Ask an Electrician Online.

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

This is a NEC 14 code question:raceway/emt sizing,I need an…

This is a NEC 14...
This is a NEC 14 code question:raceway/emt sizing,I need an explination on tables believe C9.What size eat conduit is required for 4 # 8 awg Thwn copper wires,The correct answer would be good but a explanation on how to get there is important please.not sure but if year really matters let you guys know
Thanks again.
Show More
Show Less
Ask Your Own Electrical Question
Answered in 25 minutes by:
3/25/2018
Kevin
Kevin, Licensed Electrical Contractor
Category: Electrical
Satisfied Customers: 4,461
Experience: 31 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC General Class License
Verified

Hello and welcome to Just Answer. My name is ***** ***** I will be happy to assist you with your electrical question.

Please be patient as it takes time to type and provide links. Also note that the website may be sending you a telephone offer, the offer is not originating from me.

1) The answer for a quantity of (4) four 8 AWG copper conductors using an EMT raceway is 3/4" minimal trade diameter.

2) Each 8 AWG copper THWN conductor has a square inch area of .0366. Multiply .0366 x 4 conductors = .1464 square inches total wire fill.

3) A 1/2" EMT raceway has a maximum of .304 square inches. If greater than 2 wires in an EMT conduit, maximum fill ratio is 40%. Multiply 40% x .304 = .1216 cubic inches.Therefore, .1464 square inches of wire will not satisfy the 40% rule.

4) Next EMT trade size is 3/4" diameter which has an area of .533 square inches. 40% of .533 = .2132 square inches. Therefore, .1464 square inches of wire satisfies the 40% rule and will fit inside a 3/4" diameter EMT raceway that has a maximum area of .2132 squre inches.

5) Refer to NEC Chapter 9.......... Tables 1, 4 and 5 for raceway and conductor square inches.

If you have any additional questions, just let me know and I’ll be glad to answer them for you.

Otherwise, don’t forget to rate me before you log Off.

Thanks.................Kevin:)

Ask Your Own Electrical Question
Customer reply replied 4 months ago
ok Kevin so help me out here what table will it find info/Each 8 AWG copper THWN conductor has a square inch area of .0366.
what page in the table sinec dont have copy handy & thanks for response.

1) Conductor sizes are located in Chapter 9, table # 5. Look for type "THWN" 8 AWG and it shows .0366 square inches

See this link: http://www.buildmyowncabin.com/nec/nec2014_chap9_table5.html

Ask Your Own Electrical Question
Customer reply replied 4 months ago
ok i got it .0366x 8=.1463 loc in table 5 pg 763
how get to #3 kev.

1) What you mean by #3?

Ask Your Own Electrical Question
Customer reply replied 4 months ago
would do same for step 3 please

1) Same chapter (9), and use table 4 for the various raceways.

Ask Your Own Electrical Question

Here is a link for an on-line calculator: http://conduitfillcalculator.com/

Ask Your Own Electrical Question
Kevin
Kevin, Licensed Electrical Contractor
Category: Electrical
Satisfied Customers: 4,461
Experience: 31 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC General Class License
Verified
Kevin and 87 other Electrical Specialists are ready to help you
Ask your own question now
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an electricianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Kevin Your Own Question
Kevin
Kevin
Kevin, Licensed Electrical Contractor
Category: Electrical
Satisfied Customers: 4,461
4,461 Satisfied Customers
Experience: 31 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC General Class License

Kevin is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Mike

Mike

Master Electrician

1,426 satisfied customers

Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer

Jason

Jason

Service Technician

3,958 satisfied customers

Over 20 years of experience in all types of installations, troubleshooting, and repairs.

Mike G.

Mike G.

Master Electrician

8,290 satisfied customers

Proven Professional 49 years Experience

Kevin

Kevin

Licensed Electrical Contractor

4,461 satisfied customers

31 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC General Class License

AssuredElectrical

AssuredElectrical

Master Electrician

3,264 satisfied customers

Contractor-42+ Years in the ElectricalTrade

electrifier

electrifier

Master Electrician

1,458 satisfied customers

Electrical contractor and electrical inspector for over 24 years with phone and networking expertise

Rich

Rich

Master Electrician

1,117 satisfied customers

Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain

< Previous | Next >

Related Electrical Questions
We have detached garage that has exciting what we think is
Hi, we have detached garage that has exciting what we think is 3/4 conduit what is the biggest wire we can have run?. right now they have 40 amps at the subpanel in the garage we need 60 to 80 amps so… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I am needing to install 2-220 volt outlast for my table saw
I am needing to install 2-220 volt outlast for my table saw and dust collector in my woodworking shop. Currently have 8 gauge coming from house to garage with small 4 fuse box. I will be having fuse b… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I am in arizona installing a 200 amp panel in a new location
i am in arizona installing a 200 amp panel in a new location against the wall on the outside of the house. i would like to pipe from the new panel location, into the attic and splice to the old wires … read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I'm wiring an outbuilding for 230 volts. I see arguments for
I'm wiring an outbuilding for 230 volts. I see arguments for 3-wire vs 4-wire service. What to do about neutral vs ground? I've run schedule 40 1" pvc, and am ready to pull wire. If I go with 4-wire, … read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
Electrical - I have a 200 amp panel in my house that I am
Electrical - I have a 200 amp panel in my house that I am going to drop a 60 amp breaker in and run wire approximately 100 feet to a shop in the back yard, where I have a 60 amp sub-panel with breaker… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I've got two cable runs I want to install. The first is a 72
I've got two cable runs I want to install. The first is a 72 foot run from my service panel to a sub-panel inside my detached workshop. I need 85 AMPs at the workshop with one outlet being 240V, 50 am… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I live in Central Florida and want to run a dedicated 20 amp
I live in Central Florida and want to run a dedicated 20 amp line for my above ground pool. What are the code requirements for a 100' run? Wire size? I believe our code officer said 28 inches deep in … read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I'm installing a Marey Eco270 on demand water heater
I'm installing a Marey Eco270 on demand water heater which requires (3) 50amp 20v double pole breakers using 8/3 wire. It will be located in my mechanical room about 25' from the main panel. Is instal… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
Im wiring spa. It needs a 50amp run to the disconnect, but
Im wiring for a spa. It needs a 50amp run to the disconnect, but from disconnect it calls for a 120v 20 amp circuit and a 30 amp 220v. I can only find a 50amp gfci disconnect. Can I put the 50amp gfci… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I am installing a sauna in my house and have a couple of
Hello. I am installing a sauna in my house and have a couple of questions on the electrical connections. The heater is a 8.0kw 240Volt 1 phase unit. The instructions recommend 8-2 with ground copper w… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
On a commercial remodel, it's a music venue. I've got a 200 main panel and need
On a commercial remodel, it's a music venue. I've got a 200 main panel and need sub panels in 2 different locations. Is it allowable by code to have 2 sub panels? One is running a stage, the other is … read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
Hi there, When you run household wiring 120/240vac..can you
Hi there, When you run household wiring 120/240vac..can you use one ground wire for 3 or 4 seperate circuits..I want to use 3 15 amp breakers so 1 hot to each switch..seperate neutrals back to the bre… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
Commercial electrician question(S). I just moved my shop -
Commercial electrician question(S). I just moved my wood shop - my new location has 480V 3 phase service - it has one 240/120 subpanel serviced by a 45 KVA step down transformer. (the 240 subpanel is … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
8,290 satisfied customers
hi mike i just had my panel upgraded from a 70amp panel to
hi mike i just had my panel upgraded from a 70amp panel to a 200a panel the inspector looked at the old wiring and said there are two conduits both with 14 gauge wires (hot) breaker @15a and two 12 ga… read more
Machinc
Machinc
Retired
1,018 satisfied customers
Hello, I am considering running 2 cables in an unfinished basement.
Hello, I am considering running 2 cables in an unfinished basement. One cable is a 10/3 for a dryer and the other is a 12/2 both non metallic. I would like to avoid drilling holes in the floor joists.… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I am looking for a simple answer. I am running electricity
I am looking for a simple answer. I am running electricity 100amp to a workshop sub panel approx 60ft. away from main panel in basement. I plan to use 2" PVC conduit for the entire run. What wire size… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
4,461 satisfied customers
I am doing the electrical rough-in (Boxes, conduit, wire) on
I am doing the electrical rough-in (Boxes, conduit, wire) on a kitchen re-model (DIY) and have a couple of code questions. Can you point me to a reference in the National Electric Code (NEC) and provi… read more
JACUSTOMER-0ix4l2x2-
JACUSTOMER-0ix4l2x2-
Electrical Engineering Technician
Vocational, Technical or Trade Scho
16 satisfied customers
I have 1.5 emt conduit with 28 # XXXXX is this a code violation
I have 1.5 emt conduit with 28 # XXXXX is this a code violation of CEC 310.15(B) (2) (a) and what does the CEC stand for, I'm use to comforimg to the NEC Code or quick reference Ugly's Book which say … read more
AssuredElectrical
AssuredElectrical
Master Electrician
High School or GED
3,264 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x