- Location
- Massachusetts
If I recall you do not have to add a 'second' 125% to a motor that is continuous as all motors get a 125% bump just for being motors. I may be mistaken.
30 amp breaker on 20 amp receptacle?
- Thread starter davedottcom
- Start date
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If I recall you do not have to add a 'second' 125% to a motor that is continuous as all motors get a 125% bump just for being motors. I may be mistaken.
davedottcom
Senior Member
No, I wouldn't consider it continuous. Unless it's a REALLY big hit at the smoke-shop! http://www.ryofillingstation.com/
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
The nameplate does not have 125% does it?
davedottcom
Senior Member
A second 125% ?
What was the first?
or is this (1st) 125% already calculated into the amperage on the motor nameplate?
davedottcom
Senior Member
According to what article? Are you referring to 210.21(B)(2) ? There is only (1) receptacle on the circuit so this shouldn't apply.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Here is an interesting event. Suppose you have a 25 amp ocpd on a #12 wire. Could you use a 30 amp cord and plug? T. 210.21(B)(2) states maximum load but no mention of 25 amps.
Some compressors run continuously, sometimes by design, sometimes not. Some industrial compressors are intended to run continuiously and use an unloader valve to reduce load when demand is low. Depending on the load and compressor capacity, they may never run at reduced load. In large facilities, there may be banks of large compressors, and many full time HP just to keep up with leakage.
When dealing with motors, use article 430. Some of the requirements are a bit different from ordinary wiring.
When dealing with motors, use article 430. Some of the requirements are a bit different from ordinary wiring.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
If a motor draws 18 amps then the conductors must be based on 125% of the FLA> 430.22
davedottcom
Senior Member
OK, But 430.22 is only for continuous use (3 Hrs or more) This machine completes it's duty in about 20 minutes according to the video.
Last edited:
growler
Senior Member
- Location
- Atlanta,GA
If they list 18 amps as the minimum circuit ampacity then a 20 amp circuit should be fine.
Does this machine come from the factory with a cord and male plug, if so ask what size and type. If it comes with a 20 amp twist lock then install a 20 amp twist lock receptacle. I don't remove cords and plugs that come from the factory, if they don' know what they are doing when the build it then it's not my responsibility. I don't get paid that kind of money.
If it's to be hard wired ask for a model number for the machine and see if the installation instuctions are available at the manufacturers web site. They have to buy the motor some place and there is name plate information out there. If the will give a brand name and number you can find it.
davedottcom
Senior Member
Continued!
Continued!
as you may or may not remember...I was told as long as the service voltage is 208, then a 208 V motor will work fine on a 20 amp circuit.
so...
A 20 amp circuit was permitted, installed, inspected, passed, paid for...done...right?....Wrong!
I get a call/email from the tobacco store owner saying the RYO machine now needs something "New"!?!?
Here is the email he forwarded to me...
Grainger part #4LEF9 is a transformer that has 240 Primary & 24V secondary!?
I called the guy, no answer... so, I sent an email asking for:
* Motor specs. (A Clear picture of the Nameplate on the motor)
* Name of Motor Manufacturer
* Motor Model Number
* UL listing # for the RYO machine
Continued!
as you may or may not remember...I was told as long as the service voltage is 208, then a 208 V motor will work fine on a 20 amp circuit.
so...
A 20 amp circuit was permitted, installed, inspected, passed, paid for...done...right?....Wrong!
I get a call/email from the tobacco store owner saying the RYO machine now needs something "New"!?!?
Here is the email he forwarded to me...
Grainger part #4LEF9 is a transformer that has 240 Primary & 24V secondary!?
I called the guy, no answer... so, I sent an email asking for:
* Motor specs. (A Clear picture of the Nameplate on the motor)
* Name of Motor Manufacturer
* Motor Model Number
* UL listing # for the RYO machine
growler
Senior Member
- Location
- Atlanta,GA
If the job was paid for then it's done as far as I'm conserned.
That's the great thing about installing a receptacle they can plug whatever they want into said receptacle, it's not my problem.
If the equipment shows up and needs a buck-boost tranformer well that's another job and has nothing to do with the receptacle install.
And Graigner probably isn't the cheapest place to buy a transformer.
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