Range quiz question

[tortuga]

Greeting all I am looking for feedback on the following quiz question

A residential customer with a 120/240 Volt single phase service is converting from gas to electric cooking and has purchased a range for you to install with a 50 Amp cord and a nameplate of 16.2 kW.
210.19 States branch circuits shall have an ampacity no less than the maximum load to be served. What is the calculated load and non NMB cable size for the new branch circuit?

A) 9600 VA, #8 NMB
B) 12000 VA, #6 NMB
C) 16200 VA, #4 NMB
D) 17010 VA, #4 NMB

Spoiler: My answer

A

 

[Dennis Alwon]

Your answer is correct

 

[tortuga]

Thanks I am making up some range quiz questions to add to a class.

 

[Tulsa Electrician]

Greeting all I am looking for feedback on the following quiz question

A residential customer with a 120/240 Volt single phase service is converting from gas to electric cooking and has purchased a range for you to install with a 50 Amp cord and a nameplate of 16.2 kW.
210.19 States branch circuits shall have an ampacity no less than the maximum load to be served. What is the calculated load and non NMB cable size for the new branch circuit?

A) 9600 VA, #8 NMB
B) 12000 VA, #6 NMB
C) 16200 VA, #4 NMB
D) 17010 VA, #4 NMB

No correct answer?

 

[infinity]

No correct answer?

Trick question?

 

[Dennis Alwon]

No correct answer?

That response is totally worthless without an explanation.

 

[Tulsa Electrician]

Ok guess it time to have some fun.
The word "what"was used or open to many answers. Since he did not the word which I will assume the correct answer is a calculated one.

 

[Tulsa Electrician]

I was typing when you posted. So I started with above.

 

[infinity]

He asks for the non-NMB cable size and all of the answers are NMB. Something's missing.

 

[Tulsa Electrician]

It ask for a calculated load.
"And" a non NMB cable.
Calculated load easy cable choice open to person ansawering.
The fact he used a 50 amp cord. That's a so what unless you assume.
So can we assume cord being 50 amp is plugged into a 50 amp recpt and a branch circuit rated for that circuit using a cable of choice.
Then he stats a code section 210.19
So as we continue to read thru the question it says electric cooking equipment,range,residential, 120/240 single phase, name plate 16.2 kw.
As we read thru 210.19 you need to read past the
Quoted statement and continue to (3)

Since he ask what is the calculated load part one of a two part ansawer
Calculated load is name plate at 240v.
Part two of the answer is a non NMB cable.
No answers had a non NMB cable.
Then as you read through 210.19(3).
It states" for ranges 8-3/4 kw or more rating, the minimum branch circuit rating shall be 40 ampers."
This is not the question. So (3) would not apply to ansawer and back (1) (b) and the cable of your choice for the calculated load as long as it's not NMB.

He did not ask for minimum branch circuit rating. He ask for calculated load. Which we use name plate

 

[Tulsa Electrician]

What a fun question

 

[Tulsa Electrician]

Forgot to add.
Based on the question the 50 amp cord and rept would be a violation.
Based on calculated load and the minimum ampacity required for the branch circuit.
Item to consider is 210.22
Edit, add 210.21 (1)

 

[HEYDOG]

The calculated load would be based off table 220.55 note 4. Column “C” 8kw For every KW or major fraction thereof by which the range exceeds 12 kw increase column “C” by 5% 16kw-12kw = 4 *.05 = .20 8,000 * 1.20 =9,600. 9600/240 = 40 amps

 

[Tulsa Electrician]

I forgot to give what my ansawer would be.
16.2@240= 67.5 amps
No mention of breaker temp so I will go with 60 c
I will choose USE ( SER) @60c or # 4cu 70 amp OCD.

 

[Tulsa Electrician]

The calculated load would be based off table 220.55 note 4. Column “C” 8kw For every KW or major fraction thereof by which the range exceeds 12 kw increase column “C” by 5% 16kw-12kw = 4 *.05 = .20 8,000 * 1.20 =9,600. 9600/240 = 40 amp.

So what your saying is based on 220.14 you would use table 220.50 for the part one of the ansawer.

 

[HEYDOG]

He asked for the branch circuit. Which can be sized off of note 4 table 220.55

 

[Tulsa Electrician]

At the end he did state for the new branch circuit

What is the calculated non NMB cable size for the new branch circuit?

Looks like donuts are on me.
Part 2, 220.10
Edit

 

[HEYDOG]

The question did have a distracter in it. Non NMB. I have seen many test preparation books for both journeyman and masters exams that throw in extra things that has nothing to do with what they are really asking for. I taught code classes for 16 years and taught my students to make sure they knew what the question is asking for before you start looking for a answer. Have a good evening!!!

 

[Dennis Alwon]

At the end he did state for the new branch circuit



Looks like donuts are on me.
Part 2, 220.10
Edit

He also stated for a customer with a residential service. It may be poorly worded question but I would stick with A. I did not read far enough to see it was non nmb however the wire size would be the same-- #8

 

[infinity]

He also stated for a customer with a residential service. It may be poorly worded question but I would stick with A. I did not read far enough to see it was non nmb however the wire size would be the same-- #8

Since tortuga posted the question for feedback the correct answer is that there is no correct answer based on the exact wording of the question. Another answer choice say E) None of the above would take care of that. Since this is "some range quiz questions to add to a class" the question or answers should be fixed to represent a question that can be correctly answered given the answer choices.