OCPD, next size up (next two size up)

Status
Not open for further replies.
D

de2

Member
Location
Newark, NJ
If my load is 10AMP and it is continuous load;

10*1.25 = 12.5Amp

Conductor, #12 and OCPD 15A.

Is this a NEC violation if I use 20A OCPD on this circuit? (next two size up)
 
G

ggunn

PE (Electrical), NABCEP certified
Location
Austin, TX, USA
Occupation
Consulting Electrical Engineer - Photovoltaic Systems
de2 said:
If my load is 10AMP and it is continuous load;

10*1.25 = 12.5Amp

Conductor, #12 and OCPD 15A.

Is this a NEC violation if I use 20A OCPD on this circuit? (next two size up)
Click to expand...

You can use any OCPD you want as long as your conductors are protected by it.
 
steve66

steve66

Senior Member
Location
Illinois
Occupation
Engineer
It depends on what your load is.

Does it have a MOCP (max overcurrent protection rating)?

Or is it a receptacle?

Either could change the answer.

I also believe motors have a limit to the rating of the circuit OCP. So do xformers.
 
D

de2

Member
Location
Newark, NJ
Scenario 1) Load is receptacle?

Scenario 2) Load is commercial kitchen hot bar?

Scenario 3) Lighting circuit?

Scenario 4) Motor, I know the answer this. NEC 430.54
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
de2 said:
Scenario 1) Load is receptacle?

Scenario 2) Load is commercial kitchen hot bar?

Scenario 3) Lighting circuit?

Scenario 4) Motor, I know the answer this. NEC 430.54
Click to expand...

1) Can you plug a lamp with a 60W bulb into a 20A general purpose circuit?

2) Depends.Hard wired or corded equipment?

3) Can you put just two 100W fixtures on a 20A circuit?

Are you worried about overloaded or underloaded circuits?
 
D

de2

Member
Location
Newark, NJ
Here is where question came, i have a 10amp continous load and I hate to use 15amp ocpd with #12awg. I want 20amp ocpd s i the panel so incase if load changes at least 20amp is the standart in that panel.
So 10 amp continous, 1.25= 12.5 amp calculated hard wired commercial kitchen equipment and I want to go 20amp ocpd.

Sent from my SM-G892U using Tapatalk
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
de2 said:
Here is where question came, i have a 10amp continous load and I hate to use 15amp ocpd with #12awg. I want 20amp ocpd s i the panel so incase if load changes at least 20amp is the standart in that panel.
So 10 amp continous, 1.25= 12.5 amp calculated hard wired commercial kitchen equipment and I want to go 20amp ocpd.

Sent from my SM-G892U using Tapatalk
Click to expand...

What is the MOCP on the equipment?
 
D

de2

Member
Location
Newark, NJ
What you mean fuse it? Add a fused disconnect switch beomfore the load? Thats extra cost

Sent from my SM-G892U using Tapatalk
 
D

de2

Member
Location
Newark, NJ
Letw do this, load 1, 10 amp, hot bar, non continous, and load 2, 5 amp non continous.
I want to put these two on a same single phase circuit, ocpd.
Can i use 20 amp ocpd or do I have to use 15 amp ocpd?

Sent from my SM-G892U using Tapatalk
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
de2 said:
Letw do this, load 1, 10 amp, hot bar, non continous, and load 2, 5 amp non continous.
I want to put these two on a same single phase circuit, ocpd.
Can i use 20 amp ocpd or do I have to use 15 amp ocpd?

Sent from my SM-G892U using Tapatalk
Click to expand...

You cannot put a piece of equipment on a circuit that exceeds the MOCP rating.
 
D

de2

Member
Location
Newark, NJ
What do you mean? I got 15 amp total load and I am using #12 awg. I want to use 20amp ocpd.
Are you saying run 2 branch circuit to each load?

Sent from my SM-G892U using Tapatalk
 
D

de2

Member
Location
Newark, NJ
Manufacturer data is not for MOCP, it is for load current value, i think there you misunderstand.


Sent from my SM-G892U using Tapatalk
 
Status
Not open for further replies.
Top