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Motor TOC Relay Curve - Protection Zone?
When you look at the motor running overload thermal limit curve, it is starting right after the pick up point.
Posted by spacific on 11-18-2024Motor TOC Relay Curve - Protection Zone?
GE IAC 77B TOC relay and no matter the settings because I just curious about that the relay has a gap between pick-up point and time-dial curve. Tima-dial curve starting apprx 1.5x tap setting.
Posted by spacific on 11-18-2024Motor TOC Relay Curve - Protection Zone?
What relay is being used and what are the protection settings?
Posted by Eric.Notich on 11-16-2024Instrument Transformers: Types and Testing at a Glance
In electrical power distribution systems, instrument transformers are responsible for converting high voltages and currents into lower, manageable levels that can be safely and easily measured by instruments, relays, and other devices. Instrument transformers are found extensively in various applications, including circuit breakers, switchgear, UPS systems,...
Posted by TestGuy on 11-16-2024Motor TOC Relay Curve - Protection Zone?
Hello, I'm sharing the time current curve for TOC relay and MV motor. According the relay curve, pickup point is sitting the right after the blue box. Is that meaning we don't have protection for inside the blue box? or I'm missing something?
Posted by spacific on 11-14-2024NETA 2 Exam Questions HELP
Has anyone seen the question on their NETA Exam or have input for advice. the question goes kind of as the following (trying to remember from memory) " Given the following CT 300:5, what is the minimum pick up current" They then proceed to give different choices, though I cannot remember them off the top of my head, can someone please give advice. Anoth...
Posted by HunterBink97 on 11-13-2024Report Tech Quiz Issues Here
bit of a slant on this one I think... if they are calling the 50v cut off a "operating voltage". Technically speaking, under 50v is considered dead right? According to NFPA 70E, all employees shall be instructed to be alert at all times when they are working within the limited approach boundary of energized electrical conductors, regardless of the operating...
Posted by RVAsparky on 11-09-2024Report Tech Quiz Issues Here
**3. You are asked to analyze a thermographic image of a single insulated electrical connection under 60% load, the ambient temperature recorded was 72°F and temperature points on the image indicate a temperature of 112°F at the connection in question, what would be the appropriate action level?** *Your Answer: Warrants investigation* Correct Answer: Monit...
Posted by RVAsparky on 11-04-2024Report Tech Quiz Issues Here
You need to resolve your units. The units given are inch pounds. The formula requires ft pounds. If you multiply 1.75 HP x 12 you get 21 HP.
Posted by user349 on 11-01-2024Cable Sheath Testing: Test Voltage Connection?
While the standard convention today is to connect + to the object you want "energized" and - to ground, in most instruction manuals for insulation resistance testers, it will indicate to put the + to ground and - to the specimen under test. This polarity goes back to old insulation systems that are hydrophobic (absorb moisture) and the way the water molecul...
Posted by user349 on 10-31-2024Report Tech Quiz Issues Here
**16. Arc rated protection is not necessary when wearing heavy-duty work shoes or boots.** *Your Answer: False* Correct Answer: True This question needs to specify that the "arc rated protection" in question is pertaining to and only to footwear.
Posted by Seth on 10-28-2024Report Tech Quiz Issues Here
No, one was clearly talking about human feet and the other was talking about distance
Posted by Seth on 10-28-2024- Post New Topic or Reply
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