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Hello guys, I would like your opinion regarding the following issue: Since the short-circuit level in an installation I am designing is about 60kA, I am asking for IEC LV switchgears rated 65kA/1s and also being arc resistant (65kA/1s arc duration) One of the bidders is offering 65kA/1s...

Hello, quick question: Is a 4000V IP24W IC01 motor suitable to be located outdoors in a really rainy power plant? What about IP24W IC 411? Does this combination even exist? Many thanks, JBC

Hello, I am working on a project for a Power Plant that requires a DC+UPS system like the one in the picture below The two redundant battery chargers as well as the two inverters are a 'customer requirement', but it remains 'open to interpretation' if two STS (Static-Transfer-Switches) + two...

Hello, I need to specify a 4.16 kV Switchgear for a Thermal Generation Plant. I have some 'examples' but I would like another one. I need to write an engineering deliverable. Does anyone have a Technical Specification (word/pdf) to share? I want to cover every important 'topic' Thank you in...

Hi, Imagine a big (O&G/power plant) facility (composed of many buildings and equipment) that has a large grounding mesh beneath it. This mesh is completely interconnected with each other. Is it mandatory that every power cable feeding different boards/motors in this installation has a...

Hello guys, I would like to share with you a worksheet that I've developed, aimed to size LV power cables (Up to 1kV) using IEC 60364-5-52 (https://webstore.iec.ch/publication/1878) Some information may be weird to many of you, since I live in Argentina and here we do not follow just one...

Hi, First, I am not familiar with the notation 1/C... 2/C.. 3/C... etc.. From what I've read I understand that: 1/C Means "a single cable with only one conductor (core)" 2/C Means "a single cable with two conductors (cores) inside a common outer jacket" 3/C Means "A single cable with three...

Hi, Imagine we have a distribution board, MCC, Powercenter, etc. rated "100 kA 0.5 sec", does anyone know if this conversion is valid? I²· t = (100 kA)² · (0.5 sec) = I(1 sec.) · (1.0 sec) = I(3 sec.) · (3.0 sec) .... Is this "Equation" valid to calculate withstand capability at different...

Hello, I would like to read your opinion regarding the following design criteria: Let's say we have point in a network where the available fault current (three-phase symmetrical sub-transient RMS current Ik'') is 50 kA Is it correct to install an MCC rated "30 kA 1 sec." (symmetrical RMS)...

Hello, I would like your guidance calculating the required kVA a source should have to test a MV cable doing an AC Hipot test. The test described in IEC 60502-2 consist on applying phase-to-phase voltage for 15 minutes at a frecuency of 20 to 300 Hz between the conductor and the metal...

Hello, I wonder if anyone has a nice "guide for dummies" that cover the advantages/disadvantages of using shielded/unshielded cables when feeding motors through VFDs I always thought that shielded cables were a must but when having long distances, manufacturers recommend unshielded cables...

Hello, I would appreciate your experience regarding the following situation Context: We have a 260 kW (380V) motor which is fed from a VFD. Motor moves a pump for gasoline export through a 50 km pipeline. The motor has 2 PTCs that according to the VFD's manufacturer should be wired to an...

Hello, I would like your opinion regarding the following situation: In a facility we are building (almost finished) someone designed a 13.2kV outdoor substation with (1) incoming overhead line entering through a recloser, and (7) outgoing feeders also equipped with reclosers. All the...

Hi, Will someone please explain the advantages/disadvantages of grounding single or multicore MV cables (shield) at both ends? Kind regards, JBC ....... "The more I read, the more I acquire, the more certain I am that I know nothing"

Hello, I am wondering if anyone has a "guide" to perform coordination between an autorecloser (ABB RER615) and downstream fuses, in a radial 13.2 kV aboveground network. Many thanks, JBC

Hello, Does anyone know if it is possible to use something like "concatenate" or "if" in autocad's fields/formulas (on tables) as one can normally do with Excel? i.e. =IF(A2>1,CONCATENATE(A2,A3),"") Many thanks! JBC ....... "The more I read, the more I acquire, the more certain I am that I...

Hello, I would like your comments regarding the attached picture (Instrumentation cables wired on-skid of a gas compressor - Location classified as Class I Div. II Gr. 'D' T1) Is it enough to only use a "sealer"? (At both ends) -- Cables used inside conduit are NOT armoured I am not familiar...

Hi, Does anyone have a LISP routine that runs through every layout of a drawing? I would like to adapt it to a lisp that automatically 'zooms out' every sheet in a .dwg Thanks! JBC ....... "The more I read, the more I acquire, the more certain I am that I know nothing"

Hello, I'm not very familiar with tests that are done on cables for which I would like to describe the following situation to get your opinion - The company for which I work contract another company to carry out post-installation tests on 15 kV-cables that will work in a 3x13200V network -...

Question: On a LV TN-S ground grid system... should I link a "dedicated electronic ground" with the "general ground grid" of the installation? Why/why not? Thanks! JBC ....... "The more I read, the more I acquire, the more certain I am that I know nothing"