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  1. Coco_HueHueHue

    Permanent Magnet Synchronous Generator (PSMG) - Searching for references and standards

    Hello, Currently working on a project where we integrate a Permanent Magnet Synchronous Generator (PSMG) into a Distributed Generation plant. I did that in the past for Asynchronous Generator and Synchronous Generator (field excitable), but never for PSMG. The unit is only 333kW. The general...
  2. Coco_HueHueHue

    Electrical Contact Grease Question

    Hello, I cannot identify a grease that would be good for breaker connections to switchgear busbars in 600V and 15kV equipment. Am I asking myself too many questions and a simple good quality dielectric grease from an auto part do the job or if there are specific product for that. I know for...
  3. Coco_HueHueHue

    PT Ferroresonance vs Modern SEL relay

    Hello, I am working on modifications onto an old protection panel. There are 80 ohms resistors in parallel (Y-G) of the Y-G / Y-G PTs secondary on each phase (primary is 3ph/3wire 25kV and directly connected to the utility). This is mentioned as ferroresonnance protection and it makes sense...
  4. Coco_HueHueHue

    NEC Allowed Grounding Method

    Hello, I tried to search Google for this answer, but I always end up falling on websites explaining either how grounding works or why grounding is important... But, my question is the following: What methods are good to ground a junction box housing splices for multiple 480V feeders in the...
  5. Coco_HueHueHue

    DLO Insulation Rating Question - Canada

    Hello, I have a question about DLO insulation Rating. I always used them before into 600V distribution. So i never cared about the insulation rating of 1000V vs 2000V. But, into an installation, the 2kV insulation rating is required, but this is not a typical rated voltage for cables in...
  6. Coco_HueHueHue

    Solid bottom tray with solid cover number of conductors

    Hello, Quick question that keeps me a bit confused since i almost never worked with enclosed trays. Canadian Electrical Code asks me to interpret enclosed cable trays (solid bottom with solid cover) a bit as a single big raceway. So, i need to add the number of conductors to apply the...
  7. Coco_HueHueHue

    Duct Bank Ampacity

    Hello, I was wondering if when sizing cables going through duct bank conduits, you were using this logic... For example, 2x 3C-500MCM goes through their own respective conduit within the same duct bank. I use Canadian Electrical Code, so i would use Table 2 for the allowable ampacity of not...
  8. Coco_HueHueHue

    2x 3phase circuits in the same cable... possible with local codes?

    Hello, I stumbled into a design where there are 2x 3-phase circuits (each with their own protective device) merging into a single 6 conductors 1000V rated teck cable (Canadian installation). I am a bit suspicious of this... but, I searched the local Canadian Code for something on that... i...
  9. Coco_HueHueHue

    DLO cable and OEM breaker connection

    Hello, I have a DLO cable to install Inside a 250A Eaton HJD2250 breaker. Browsing google, i am now almost sure that this fine stranding (262.6 kcmil) is not made to be squeezed and torqued in that breaker terminal. I don't know which products exist on the market to fufill this job. There must...
  10. Coco_HueHueHue

    Cabling/Metallic Flexible Conduit Question

    Hello, Reading Canadian Electrical Code 12-1004 (Rigid and Flexible Metal Conduit), it is written: "No conduits having an internal diameter of less than 16 trade size shall be used, except that a) 12 trade size flexible metal conduit shall be permitted to be used for runs of not more than 1.5m...
  11. Coco_HueHueHue

    Canadian Electrical Code Ampacity Question

    Hello there! Does anybody here knows the Canadian Electrical Code well? Here is my problem. I have a 1 X 3conductor 350 mcm 15kV TECK90 cable that runs buried on almost all of its run. Except at the end. The last 15 feet will be outdoor in a ladder cable tray. The ampacity tables given in the...
  12. Coco_HueHueHue

    Old piping insulation resistance fire resistance

    Hello, First of all, i just want to clarify that i do not have any mechanical engineering experience, but that i am electrical. I am trying to install a new heat tracing system onto an old steel 18 inches steel pipe. The thing is, the pipe is inside of a very restrained space and it could be...
  13. Coco_HueHueHue

    Fan motor with a VFD running at low frequency question

    Hello, I did browse the internet a lot and only found part of the answer to a question i am asking myself. I keep reading that running a VFD in V/Hz control mode at a low frequency will overheat the motor. I keep reading that the magnetizing current is significant and the motor can't cool down...

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