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Hi RedSnake, Thank you for your thorough response. That is a big help. It seems to me like the Baumer sensor will very likely work for us. Looking over the considerations in the Baumer guideline document you sent a link for, (and please correct me if I am wrong) it seems like Push-Pull is...

Hi, I have a label inspection machine that makes use of Tri-Tronics Label-Eye LERC label sensor. This machine processes a continuous series of labels that are adhered to a backing material. The sensor detects the gaps between each label. This is a "fork" style sensor that requires the labels...

Hi, I have a three phase resistance heater as shown in the attached diagram. I know the formula for power is P = I * E * 1.732. Based on the information shown, this comes to P = 22.6 * 480 * 1.732 = 17,789 watts. This is pretty close to the 18,650 watts shown on the diagram, so this...

Hi Rich, Waross, IRStuff, and Che, Thank you all for you input. It is very much appreciated. The case that handle pointing down (6:00) would be OFF and handle pointing left (9:00) would be ON seems logical to me. A switch like this wouldn't be affected by gravity, but if it were, gravity...

Hi Che, Waross, IRStuff, and Rich, Thank you for your replies. It makes sense to me that it should be easier to turn the switch OFF than it is to turn it ON, and if gravity were to have an effect, gravity should turn it OFF rather than ON. This makes me think that mounting the switch so that...

Hi, I am going to be using a control panel door mounted disconnect for which the handle looks like this ... ... This handle is constructed so that it will rotate 90 degrees clock-wise from the OFF position to the ON position. It seems this will allow me to mount this in a few different...

Hi JRaef and Lionel, Thank you for your replies. I wish I had the budget to participate in the training that would be required to become a UL listed shop, but I do not. My company has recently ceased to manufacture new equipment. The specific project I have been asking questions about is to...

Thank you Waross and LionelHutz for your most recent posts, and thank you again to everyone else who participated in this thread. I have learned a great deal by asking questions related to my current project. All of your help is very much appreciated. Thanks again! Paul

Hi, I have been trying to design an Industrial Control Panel that complies with the guidelines in UL508A. I am up to the point where I am choosing wire colors for the internal wiring in my panel. As my control panel will be used with industrial machinery, I am looking at the section of UL508A...

Hi Che, resqcapt19, and Waross - Thank you very much for your replies. I am now feeling comfortable that I can use 10 AWG copper for my grounding conductor for this circuit, and 8 AWG for the current carrying conductors. As shared by Waross, I do remember seeing table 15.1 when I was reading...

Thank you Che and Mike - Che - Can I ask what version of the NEC (NFPA 70) you are referring to? I am looking at the 2020 version, but table 250-122 in my copy only shows OCPD ampere ratings of 15, 20, 60, 100 (and higher) amps. There is no row in my copy for 40 amps. Regardless, this table...

Hi, I have been trying to design an Industrial Control Panel following the guidelines in UL508A. I have asked several questions related to this project, and members in this forum have been incredibly helpful. I am now at the point where I have ordered all my components, and now I am trying to...

Thank you Jraef for the great explanation - the difference is now very clear to me. I appreciate your help! Best regards, Paul

Hi Waross, Thank you for your explanation. The SSR I'll be using will be using a zero crossing turn on. I'll be building a new control panel to replace one that has been in use in a machine control application for about 30 years. The main reason for doing this is just to end our reliance on...

Thank you Lionel, I did read UL508A per your suggestion in another thread I started when I was trying to determine whether I should include main fuses for the main disconnect in an Industrial Control Panel I have been designing. This led me to the realization that the disconnect I was planning...

Hi, I have an application in which I will be using a solid-state relay with a closed-loop temperature controller to regulate the power to a resistance heater. The voltage will be 208 VAC single phase and the heater resistance will be 7.2 ohms, so the expected current is 28.9 amps when the...

Thank you IRStuff - that is a good suggestion. I will reach out to alphawire and see if I can get an application engineer to shed some light. I appreciate your help. Best regards, Paul

Thank you FacEngrPE, That is a good example of a case where conductors smaller than 18 gage are clearly considered acceptable. The way that NFPA sections 12.6.3 and 12.6.4 are written still makes it difficult (at least in my mind) to differentiate between circumstances where 12.6.3 applies...

Hi, I have been studying NFPA 79 with my goal being to understand the conductor sizing requirements for an Industrial Control Panel. I understand that in the USA, this might also be governed by UL508A, but at the moment, I am just trying to understand NFPA 79. I am having a hard time...

Thank you Ed - your point is well taken. I have asked several questions related to the same control panel project I am working on. I have learned a great deal from you and others on this forum. I am going to be replacing a 36 x 36 x 12 inch deep panel that was built in 1993. It is terribly...