kitchen supply fan and exhaust fan

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hhsting

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Glen bunie, md, us
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Junior plan reviewer
I have kitchen supply fan and kitchen hood exhaust fan on roof. I wanted to size the circuit breaker for those two fans am confused in regards to which section to use to size the breaker in NEC 2014. I thought 430 is used for stand alone motors and not packaged motors.

Does anyone know which section NEC 2014 applies to size circuit breakers?
 
If it's a package unit the info should be on the equipment.

Roger
 
1) See
FIGURE 430.1 Article 430 Contents

2) Find
Motor Branch-Circuit Short-Circuit and Ground-Fault ---------- Part IV
Protection, 430.51 through 430.58

3) Read
430.53 Several Motors or Loads on One Branch Circuit.
 
hhsting said:
Actually the designer says for any kitchen supply fan and kitchen hood exhaust fan in the USA manufacturer don’t provide MOCP or MCA.
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So instead of listening to the designer go look for yourself. As a plan reviewer you should ask for the submittals, plans and drawings are only a part of the design documents.

Roger
 
roger said:
So instead of listening to the designer go look for yourself. As a plan reviewer you should ask for the submittals, plans and drawings are only a part of the design documents.

Roger
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Well I asked the designer for manufacturer datasheet as well as MOCP and MCA. The designer came back saying manufacturer never provide MOCP MCA in USA roof supply fan and roof exhaust fan kitchen hood.

Also asked him to provide letter from manufacturer stating their is no MOCP MCA provided and with manufacturer name and contact info. Didnt give. Instead went higher up the chain
 
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The packaged hood controllers I've installed had were basically mini-starter contactors for the fans.

Otherwise, I've always run 1ph motors on regular 20a circuits, either directly or through contactors.
 
LarryFine said:
The packaged hood controllers I've installed had were basically mini-starter contactors for the fans.

Otherwise, I've always run 1ph motors on regular 20a circuits, either directly or through contactors.
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Plans show Supply Fan Marashall Air Systems Model L5B S1510 but when I look up internet their is no model number. Its 1.5 HP single phase 120V supply fan
 
If you are reviewing plans then shouldn't this information be provided on the plans? Why do you have to do all the research?
 
tom baker said:
If you are reviewing plans then shouldn't this information be provided on the plans? Why do you have to do all the research?
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They provide 30A breaker for supply fan.

Plans dont show MOCP or MCA. Asked the designer says MOCP MCA are never provided in the USA for supply fan
 
The are way too many possibilities to give a definite answer. Being a kitchen hood with make-up and exhaust there are going to be some type controllers (contactors/starters). Most come with a control cabinet which should have input data
(# of circuits/size,etc).
As far as the motors themselves they would fall under Art 430.
You can't really size anything until you know # of circuits and presence of overload protection.
Bottom line, without a lot more input there is nothing you can do from your desk to assure proper circuits.
 
augie47 said:
The are way too many possibilities to give a definite answer. Being a kitchen hood with make-up and exhaust there are going to be some type controllers (contactors/starters). Most come with a control cabinet which should have input data
(# of circuits/size,etc).
As far as the motors themselves they would fall under Art 430.
You can't really size anything until you know # of circuits and presence of overload protection.
Bottom line, without a lot more input there is nothing you can do from your desk to assure proper circuits.
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From plans supply fan has following. I don’t have control diagram.

motor overload protection,
wire disconnect switch,
backdraft damper,
integral fan speed control for balancing, electrical contractor provide interlock between kitchen hood fans and supply fan,
Filter air inlet,
Interlock SF-1 operation with both kitchen hoods exhaust fans,
Provide fan with top discharge


Exhaust fan come with following:
factory mounted and wired disconnect switch,
backdraft damper,
Integral fan speed control for balancing,
Motor overload protection,
Exhaust grease,
Provide 12” high discharge extension,
Electrical contactor provide interlock between hood fans and MUA-1
 
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Looks like they have OL protection. The designer/engineer should have followed Art 430.22 Part IV for sizing SCGF protection for a circuit to each motor.
 
augie47 said:
Looks like they have OL protection. The designer/engineer should have followed Art 430.22 Part IV for sizing SCGF protection for a circuit to each motor.
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I am just curious are not all kitchen supply fans required to have overload protection? Is their any that does Not have overload protection and in that case then manufacturer would provide MOCP, MCA?
 
hhsting said:
They provide 30A breaker for supply fan.

Plans dont show MOCP or MCA. Asked the designer says MOCP MCA are never provided in the USA for supply fan
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I fail to see how you are expected to review plans and don’t have all the information needed.
Send the plans back with FAIL on them and tell them to supply the information you ask for.
The designer should supply the pertinent code articles, you should look to make sure those articles apply to what your reviewing. Hence the word “reviewer” vs “researcher”
 
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