Has anyone ever heard of this manufacturer? That's right, it's "Simplx", no "e".
They have some breakers in a generator I'm trying to model in SKM. SKM of course has no information on them, and the best I can find on the internet is some similar stuff being sold on ebay.
Thanks in advance,
Tom
Can anyone help me in explaining the pros and cons of quartz restrike vs. pulse-start ballasts on HID lighting? The way I understand it, quartz restrike provides immediate low-level illumination during the HID's re-lamping period following a power outage via a separate quartz filament, while...
I'm a consulting electrical engineer designing my first food processing facility, with limited resources/old projects to refer to in my design.
I am familiar with the types of light fixtures required for these designs, and have already talked with several vendors regarding what should be...
I'm a consulting electrical engineer designing my first food processing facility, and I have only a limited number of resournces/old projects to refer to in my design.
I am familiar with the types of light fixtures required for these designs, and have already talked with several vendors...
I am trying to determine if a Square D type NEHB panelboard with type EHB branch circuit breakers (both discontinued) can be used in series with a type KI breaker, on a system with approx. 35kA available fault current.
The EHB breakers are rated for 14kA at 277/480, but literature from our...
In obtaining available fault current for a 750kVA service being provided by a local utility, the utility rep told me, "maximum available fault current is 17,055 AIC, and the ultimate available fault current is 56,845 AIC."
I didn't ask what the difference was, thinking I could research it...
What exactly are sequence networks? I have taken courses on power systems analysis and read other material on the subject, and the most I can gather is that it’s simply a different domain, and that voltages and currents can be mapped into this domain and manipulated easier than in the time...
I see frequent talk in this forum about SF6 switches and how they’re primarily used in Europe. I’ve worked on projects here in the States where we’ve specified them, but it always has to do with space and cable routing issues. The SF6 switches (as I know them anyway) are wider than they are...
Could someone briefly explain to me the difference between meggering and hi-pot testing of cables? I know that meggering involves placing a DC current, usually no more than 2 times the rated AC voltage, between the cable and ground to test the insulation resistance.
Hi-pot testing involves a...
Before I begin, I should point out here, my firm is an real estate developer with an A/E staff. The architects produce contract drawings, while the M/E staff simply works with the architects during the D/D phase to make sure proper space is allocated for equipment, and then produces a...
Per NEC 240.4(B), a 277/480V, 800A feeder is allowed to be the industry standard of 2 sets of 3-1/2”C, (4)#500, (1)#2G even though the ampacity of the feeders are only 380A. However, it seems that I’ve seen this standard applied to 1200A and 1600A feeders as well, even though 240.4(C) requires...
Performed a walk-through of a facility to determine the condition/reliability of the electrical distribution system for a future tenant.
There are three 1000/1500kVA indoor dry-type substations, 13.8kV-277/480V substations, two of which are 29 years old. The transformer for the third SS is...
Early in my career, I worked at a firm where the standard spec always called for a fused local disconnect for rooftop A/C units, in addition to the circuit breaker protecting it from the service panel. Any other HVAC equip. like air handlers and unit heaters only required NF disconnects. I...
If a 13.8kV-480/277 2500 kVA AA/FA transformer is placed facing the 277/480V, 2500A switchboard it serves, does condition 2 or 3 of Table 110.26(A)(1) apply? Since a transformer is never worked on live, I would think the enclosure could be considered grounded and thus it would fall under...
I already know what the difference is between metal clad and metal enclosed. MC has barriers everywhere to prevent accessing one compartment from another, and ME does not. My question is, how do you determine which to use for a given application? It would seem that you would always want to go...
I have a client who is trying to "cut fat" from a project, and one item they are proposing is moving some of the larger loads on their system from the main distribution switchboard (where breaker "real estate" is much higher) to a downstream distribution panel. We're talking...
