Good afternoon,
I am attempting to figure out what is meant by the CT symbol in the attached picture. I work in the US and I have never seen a CT shown like this, especially with two polarity marks.
Thank you!
Kyle
I'm having a hard time finding exactly how the 52aa and 52bb contacts work for a disconnect switch. I believe they work as follows, but please correct me if I'm wrong:
As the disconnect closes from open: 52bb opens, 52aa closes, 52b stays closed, 52a stays open
When the disconnect is closed...
Good afternoon,
It has been mentioned in some seminars that I've attended that the PPE requirements of an arc flash study can be lowered by 2 categories if the switchgear door is closed (closed-door racking, etc). Is this an industry-wide assumption or the ramblings of the un-educated? If it...
Good morning folks,
I am trying to size some 15kV cables that will be laid in cable trench. I would rather not use ventilated cable trench though some have said these can achieve "free-air" ratings.
I've gotten my hands on a study titled "Ampacity of Conductors in Ventilated Cable Trench" by...
I've come across an odd situation in a switchyard outside of a power plant. An electro-mechanical high impedance differential relay (KAB) is used as bus differential protection. As is practice, a lockout contact is used to short-circuit the varistor in order to prevent it from overheating.
I...
You will have to excuse my ignorance as I am not as experienced with AutoCAD as I would like to be. I get to do a little electrical drafting now and then. We just upgraded from AutoCAD 2004 to 2005. I like most of the features in 2005, but one plotting element has me a little confused.
In...
We have used Pulsar for several years, and we just recently purchased a Doble F6150. Our techs are familiar with the Doble lineup so I am confident that they will be able to run with this. My problem is the creation of test plans. I understand the macros as they are similar to those of the...
