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varmit varmit is offline

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  1. Ryan@1stDay
    08-17-2016 01:22 AM - permalink
    [email protected]
    Hi

    I am currently trying to size my circuit conductors and breaker for a paint booth.
    The electrical in the booth consists of:
    - 20 LED lights @ .45amps each..... 9amps
    - 1 10hp 208volt motor....... NEC FLC 30.8amps
    - 1 7.5hp 208volt motor...... NEC FLC 24.2amps

    Now, what I have found is based on article 430.24 I will size my conductors based 125percent of the largest motor(38.5amps), plus the sum of the s2nd motor(24.2amps), plus the 9amps for th lighting load..

    This would bring me to, 71.7amps(#4THHN)

    Now, would I then take that total(71.7amps) and apply T430.52 to size my Breaker?? In which case, 71.7amps @ 175percent would be a 125amp breaker.?

    I feel like I am missing/overlooking something here..

    Thank you in advance for all your help!

About Me

  • About varmit
    Professional Biography
    I have done electrical work for 48 years, mostly industrial and commercial with some residential in my early career. Mostly these days I do controls, instrumentation and VFD work.
    What is your electrical related field/trade:
    Master Electrician/Instrument Tech
    General Location
    Northern Kentucky
    Special Skills, Interests, and Hobbies
    Ride and race bicycles
    Occupation
    Electrician, controls tech, junk equipment fixer
  • My Company
    Service Area
    Cincinnati/Northern Kentucky

Statistics

Total Posts
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General Information
  • Last Activity: 11-10-2019 10:15 PM
  • Join Date: 04-19-2009
  • Referrals: 0

Mentions

08-22-2019
01:18 PM - Navyguy mentioned varmit in post Planning a Electrical Run
...would be similar to varmit explanation. I woul...
05-28-2017
01:00 PM - MerakVerer mentioned varmit in post Best multimeter?
varmit Thank you I have loo...

Quotes

11-10-2019
07:36 AM - paulengr quoted varmit in post Multiple motors on one soft start
If the disconnect was opene...
01:19 AM - varmit quoted gpop in post Multiple motors on one soft start
why would opening or clos...
01:13 AM - varmit quoted gpop in post Multiple motors on one soft start
[quote=gpop;5259886]why would op...
11-09-2019
11:18 AM - dronai quoted varmit in post Variable Speed Conrol- Pump
If you have a single phase ...
02:05 AM - gpop quoted varmit in post Multiple motors on one soft start
If someone opens or closes ...
11-06-2019
10:28 PM - dronai quoted varmit in post Ferrules
... terminations. Varmit, You work at a plant...
06:47 PM - Southeast Power quoted varmit in post Use of RHW-2 in EMT or other 2 hour fire rated Conductor
From long ago memory: RHW h...
10-17-2019
08:18 PM - ElectricMatt quoted varmit in post Intrinsically safe float relay in wet well
You will need intrinsically...
10-09-2019
01:25 PM - splatz quoted varmit in post Simple Stepper Motor Drive
The Automation Direct unit ...
09-20-2019
07:30 AM - Kevhuff26 quoted varmit in post 13.8kv Motor Terminations
The radius of the upper wir...
09-17-2019
08:27 PM - JRaef quoted varmit in post 25 hp Wye Delta motor problem
Everything has "always work...
09-14-2019
04:33 PM - Switched quoted varmit in post Torque wrench
I have two of the "click" t...
09-01-2019
05:49 PM - varmit quoted acro in post Grounded B phase - where to bond?
Keep in mind that in most...
10:52 AM - varmit quoted acro in post Grounded B phase - where to bond?
But. Wthout a ground on t...
10:37 AM - acro quoted varmit in post Grounded B phase - where to bond?
If the generator is a wye u...
08-21-2019
11:56 PM - paulengr quoted varmit in post Planning a Electrical Run
Depending on your plant rul...
08-20-2019
07:34 AM - Paul SA quoted varmit in post Planning a Electrical Run
...kill. i agree with Varmit don't over think it ...
06-18-2019
10:15 PM - DashDingo quoted varmit in post shirts
!00 percent cotton T shirts...
06-11-2019
10:44 AM - Jarp Habib quoted varmit in post I line breakers ABC CBA left side right side rotation
You never know how some els...
06-08-2019
06:13 PM - gpop quoted varmit in post Oversized breaker in drive panel
430.122 is what would apply...

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