Wire and Conduit Size for Exhaust Ventilation Fans

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C

CEO@TRCEnergy.com

Member
Location
Jacksonville, FL, U.S.
Need help to verify wire and conduit size for the following exhaust ventilation fans:


1.5 HP /
1-Phase(Al)____3-Phase (Al)____1-Phase (Cu)_____3-Phase (Cu)_____Conduit Size
_____​
​


2 HP /
1-Phase(Al)____3-Phase (Al)____1-Phase (Cu)_____3-Phase (Cu)_____Conduit Size
_____​
​


3 HP /
1-Phase(Al)____3-Phase (Al)____1-Phase (Cu)_____3-Phase (Cu)_____Conduit Size
_____​
​


5 HP /
3-Phase (Al)____3-Phase (Cu)_____Conduit Size
_____​
​


​


Thanks in advance. :angel:
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Do you have a codebook?

T430.250 for 3Ø motors
T430.248 for 1Ø motors
T310.15(B)(16) Conductor Ampacity
Chapter 9, Annex C Raceway Fill
 
don_resqcapt19

don_resqcapt19

Moderator
Staff member
Location
Illinois
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retired electrician
First you need the motor voltage, then you go to 430.22, 430.6, and on to the list of sections Rob posted.
 
C

CEO@TRCEnergy.com

Member
Location
Jacksonville, FL, U.S.
1Ø and 3Ø Fan Motor Wiring Required per 2017 NEC and Conduit Material Recommendations

1Ø and 3Ø Fan Motor Wiring Required per 2017 NEC and Conduit Material Recommendations

Could you please help me in verifying the wire size (AWG) requirements for the following 7 motors, along with your best recommendation for the most practical conduit material options. This is for a project in Jacksonville, FL.

Fan Motor 1.5HP/1ØFan Motor 1.5HP/3ØFan Motor 2.0HP/1ØFan Motor 2.0HP/3ØFan Motor 3.0HP/1ØFan Motor 3.0HP/3ØFan Motor 5.0HP/3Ø
Voltage115115115230115230230
Full Load Amps2316235.2297.411.6
Starting Amps1563815648.617275108
Service Factor1.151.151.151.151.151.151.15
Insulation ClassF BF BF F F
Full Load Efficiency747074847685.587.5
Full Load Power Factor82858288878982
NEMA Design CodeLLLBLBB
Thermal ProtectionNoNoNoNoNoNoNo
Motor Weight51-lbs56-lbs51-lbs43-lbs73-lbs57-lbs73-lbs
Al Wiring Size Required (AWG)
Cu Wiring Size Required (AWG)
1st Best Conduit Option
2nd Best Conduit Option

Thanks in advance for your help. :angel:

Take Care, TCC :cool:
 
petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
Jraef said:
There is probably an error on your 2nd column. there is no such thing as 115V 3 phase.
Click to expand...

There is probably an error in either your first or third column as well since they are shown as the same FLA but different HP.

incidentally, your wire sizing has to use the charts, not what is on the nameplate. It appears you have used the nameplate FLA here.

is there some reason you can't change them all to be 3 phase?

i would not be using aluminum wire for small branch circuits like this.
 
I

Ingenieur

Senior Member
Location
Earth
you are a EE PE? and an unlimited class elec contractor?
nec table fla for the rated hp x 1.25 = min ampacity
use 75 C column from nec table
 
petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
Ingenieur said:
you are a EE PE?
Click to expand...

Registered Professional Engineer and Certified Electrical Contractor (Unlimited) according to his profile. Seems like some really basic questions to be asking for an EC.

ETA: What is a "certified" contractor anyway? Never heard of that before.
 
Last edited:
C

CEO@TRCEnergy.com

Member
Location
Jacksonville, FL, U.S.
Re: Wire and Conduit Size for Exhaust Ventilation Fans

Fixed the typo in 3rd column. Thanks in advance for the guidance. :angel:

Fan Motor 1.5HP/1ØFan Motor 1.5HP/3ØFan Motor 2.0HP/1ØFan Motor 2.0HP/3ØFan Motor 3.0HP/1ØFan Motor 3.0HP/3ØFan Motor 5.0HP/3Ø
Voltage115230115230115230230
Full Load Amps2316235.2297.411.6
Starting Amps1563815648.617275108
Service Factor1.151.151.151.151.151.151.15
Insulation ClassF BF BF F F
Full Load Efficiency747074847685.587.5
Full Load Power Factor82858288878982
NEMA Design CodeLLLBLBB
Thermal ProtectionNoNoNoNoNoNoNo
Motor Weight51-lbs56-lbs51-lbs43-lbs73-lbs57-lbs73-lbs
Al Wiring Size Required (AWG)
Cu Wiring Size Required (AWG)
1st Best Conduit Option
2nd Best Conduit Option


Take Care, TCC :cool:
 
I

Ingenieur

Senior Member
Location
Earth
get the nec
look up fla for the hp/phase/v for each motor
mult each fla x 1.25 = min ampacity
select the conductor from the nec tables
providing no adjustments/derating is required

the conduit size can be likely selected from nec tables
the type can't: need to know location info
wet/dry
int/ext
buried, underslab
subject to damage
exposed/concealed
haz classified area
etc

you pick them, we'll review, comment, correct
 
C

CEO@TRCEnergy.com

Member
Location
Jacksonville, FL, U.S.
Location is Fire and Rescue Dept, fans will be mounted above trucks as a Vehicle Exhaust Ventilation System, so I'm thinking "dry to damp" interior conditions apply here?

Type A Rigid PVC conduit, ENT, FMC, or even Liquid-tight FNC --> I'm thinking would be least expensive conduit options? Any recommendations?


Fan Motor 1.5HP/1ØFan Motor 1.5HP/3ØFan Motor 2.0HP/1ØFan Motor 2.0HP/3ØFan Motor 3.0HP/1ØFan Motor 3.0HP/3ØFan Motor 5.0HP/3Ø
Voltage115230115230115230230
Full Load Amps2316235.2297.411.6
Starting Amps1563815648.617275108
Service Factor1.151.151.151.151.151.151.15
Insulation ClassF BF BF F F
Full Load Efficiency747074847685.587.5
Full Load Power Factor82858288878982
NEMA Design CodeLLLBLBB
Thermal ProtectionNoNoNoNoNoNoNo
Motor Weight51-lbs56-lbs51-lbs43-lbs73-lbs57-lbs73-lbs
Cu Wiring Size Required (AWG)10 AWG THHN 12 AWG THHN 10 AWG THHN 18 AWG THHN 8 AWG THHN 18 AWG THHN 14 AWG THHN
1st Best Conduit Option
2nd Best Conduit Option
 
don_resqcapt19

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
I would not even think about PVC for an interior installation, by the time you add all of the additional supports required for PVC, it will likely be more expensive than EMT.
 
I

Ingenieur

Senior Member
Location
Earth
the smallest I would use is #14
not sure where you got values for 18? use the 75 C unless derating
I would use emt with compression fittings

are you an EE PE and electrical contractor?
trc energy is a huge firm, hundreds of employees and dozens of offices
"With over 4,100 technical professionals and support personnel at more than 120 offices throughout the U.S."
you are the ceo? https://www.trcsolutions.com/about/leadership
https://www.trcsolutions.com/
why would the ceo of a 4000 person company size fan wires?
this is 1st yr apprentice stuff

75 C THWN or THHW
fla..x1.25...Cu...Al
20 7.5 12 10
6 7.5 14 12
6.8 8.5 14 12
34 42.5 8 6
9.6 12 14 12
15.2 19 14 12

if run against clg a temp adjustment may need made for some
 
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petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
I don't think you are not allowed to use smaller than #14 unless you run it in cord and you normally are not allowed to use cord.

I would not run smaller than #12, just because it is a lot harder to break than #14.
 
C

CEO@TRCEnergy.com

Member
Location
Jacksonville, FL, U.S.
That's not me. I'm not TRC Solutions.

Just passed my EC exam late last year, and yes, I am into my 1st year of working at it.

It's really great to have experienced pros like you guys
as a sounding board, ​
and this forum as a resource! :cool::D:happyno::angel:
 
I

Ingenieur

Senior Member
Location
Earth
CEO@TRCEnergy.com said:
That's not me. I'm not TRC Solutions.

Just passed my EC exam late last year, and yes, I am into my 1st year of working at it.

It's really great to have experienced pros like you guys
as a sounding board, ​
and this forum as a resource! :cool::D:happyno::angel:
Click to expand...

trc energy is a division of trc solutions, the largest, 40% of its business???
are you an electrical PE?
would that not make YOU the pro?

please be careful asking questions like this, you are in responsible charge of the work
and should only do work you are competent in
Company Name

Professional Engineering Leadership and Construction Management.
Construction management, full-service project commissioning, electrical engineering design, and engineering inspection of renewable energy & energy efficiency technology, electric power grid repair & modernization services, and solar thermal water heating systems.
 
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