Ckt for a heater

Status
Not open for further replies.
N

nickelec

Senior Member
Location
US
How do you guys interpret this ckt
To me it's #8 on a 55a breaker
15a for motor +40a for heater
929dac02331f7acf6dd43dec9656e2e1.jpg


Sent from my SM-G965U using Tapatalk
 
nickelec said:
How do you guys interpret this ckt
To me it's #8 on a 55a breaker
15a for motor +40a for heater

Sent from my SM-G965U using Tapatalk
Click to expand...

I think you need two branch circuits. One a 15A and the other a 40A. You can make this a feeder out to the equipment and than create two branch circuits by supplying two OCPD near the equipment .

I think the feeder OCPD would need to be in accordance with 430.63.

I think the feeder conductors need to be #8.
 
I see it requiring (2) overcurrent devices/circuits to the equipment itself.
 
It could be possible I have to double-check I only remember seeing one spot for terminations

Sent from my SM-G965U using Tapatalk
 
Even if it did need to feeds could I supply it with one and then put two ocpd at the unit

Sent from my SM-G965U using Tapatalk
 
nickelec said:
Even if it did need to feeds could I supply it with one and then put two ocpd at the unit

Sent from my SM-G965U using Tapatalk
Click to expand...

Sure
Your feeder size would be dependent on the type cable and termination limitations ie: Romex 60°
 
Looks like two circuits there's that 2nd block on the bottom left there did not notice it before
b8d1c0ea88809dcf849248c5a10bef59.jpg
e3ae0c819fcac1fab047605edd4b13ec.jpg


Sent from my SM-G965U using Tapatalk
 
I'm using fmc (greenfeild) and thhn the problem is I priced and speced the job for a unit
Then when they arrived the unit was completely different so now I'm trying to utilize the existing conduit I already ran and just adding one more as opposed to completely redoing it.

So if I can I would like to run a feeder rated at 55 amps into a junction box and from that junction box tap to disconnects one rated for 40 and one rated for 15

Sent from my SM-G965U using Tapatalk
 
I'm confused, it says an MCA and a MaxOCPD why would this be anything more than a single 40 amp circuit?
 
Many of the AC units I see have a nameplate that covers mutli-circuit or and/or single circuit.
I agree this looks like the same thing but I don't see a "single circuit" rating.
may just be me :)
 
infinity said:
It's no different than an AC unit.
Click to expand...
No, but I agree with Augie, many units have both single and combined circuit ratings/markings, this one seems to have single circuit ratings only. Why, IDK?

Units with combined circuit ratings often have internal overcurrent protection for each sub-circuit though.

May be listing requirements thing?
 
If it can be on one single circuit I see no reason it needs to have any more than 37.0 amps minimum conductor ampacity and 40 amp overcurrent device. If it can not be on one circuit a feeder of 37.0 and 40 amp overcurrent to a nearby subpanel would still be acceptable and then run the two required circuits from that.
 
nickelec said:
I'm using fmc (greenfeild) and thhn the problem is I priced and speced the job for a unit
Then when they arrived the unit was completely different (wish I had a $$ for every time that happened)so now I'm trying to utilize the existing conduit I already ran and just adding one more as opposed to completely redoing it.

So if I can I would like to run a feeder rated at 55 amps into a junction box and from that junction box tap to disconnects one rated for 40 and one rated for 15

Sent from my SM-G965U using Tapatalk
Click to expand...

I see no problem with that
 
Status
Not open for further replies.
Top