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Recent content by PaulBr

  1. PaulBr

    Tap Conductor rules in IEC standards

    In USA per NEC (National Electric Code) definition: Tap conductor is Conductor with an upstream overcurrent protection whose rating exceeds the maximum ampacity of the conductor. NEC has some rules that limit length and ampacity of tap conductors. Are Tap Conductor rules unique to NEC or there...
  2. PaulBr

    Interpret VFD spec for motors

    I think overload to 115% is to address dynamic of rotational load during acceleration or deceleration, when in addition to static load there is load from inertia which needs to be overcome. PaulBr.
  3. PaulBr

    VFD cable and compression lugs

    Thank you all for the info. Something to study. PaulBr.
  4. PaulBr

    VFD cable and compression lugs

    Is VFD cable requiring special compression lugs? In our application we are using 500 MCM VFD cable, Lutze A2205003. Link We intended to use compression lugs 500 MCM compression lugs, Punduit LCA500-1-6 with this cable: Link However, when conductor is stripped from isolation fine strands...
  5. PaulBr

    460VAC 60Hz Motor on 400VAC 60Hz?

    Couple years ago we have built machine for Saudi Arabia. It was 3 phase 380V, 60Hz. PaulBr
  6. PaulBr

    Is it IEC (CE) requirement to provide assisted start to 3 ph induction motor above certain size?

    I apologize for not being clear. I was using terminology that our customer was using. By assisted start they mean use of a) delta - wye contactor arrangement; b)soft start; or c)VFD. Motor in question is 3 phase, 50Hz,400VAC, 45kW motor. Customer is located not in EU but is trying to follow IEC...
  7. PaulBr

    Is it IEC (CE) requirement to provide assisted start to 3 ph induction motor above certain size?

    Hello guy: Does anyone know answer to question in subject line? If it is indeed requirement, can relevant documents to be sited? Motor in question is regular 3 phase squirrel cage induction motor. If this is just good practice in IEC world, then when (motor size) it needs to be used? Best...
  8. PaulBr

    61000-6-2 Electromagnetic Compatibility (EMC) for industrial machinery

    Hoxton, Thank you very much for taking second look and for the pointing to relevant standards. Regards, PaulBr
  9. PaulBr

    61000-6-2 Electromagnetic Compatibility (EMC) for industrial machinery

    The matter of fact this is not the first machine, but second one. Consultant was hired for the first machine. That machine was very similar but slightly smaller that current one we building. His rationale do not have EMC test was that all devices have own DoC with EMC declarations in it. During...
  10. PaulBr

    61000-6-2 Electromagnetic Compatibility (EMC) for industrial machinery

    Hoxton, Thank you very much for the input and posted attachment. We will study it. A little bit of background: We are original equipment manufacturer located in US. We are building large piece of machinery (consisting of 40 VFD motor circuits, PLC, etc.) which will go to France. These machines...
  11. PaulBr

    61000-6-2 Electromagnetic Compatibility (EMC) for industrial machinery

    Thank you for reply. I am still not completely convinced. VFD manufacturer is stating in user manual that if its product connected according to the provided instructions it will meet EMC requirements. It implies that this manufacturer conducted testing, where input power was connected to drive...
  12. PaulBr

    61000-6-2 Electromagnetic Compatibility (EMC) for industrial machinery

    Hello fellows: How this standard, 61000-6-2 Electromagnetic Compatibility (EMC), is applied to industrial machinery. Words in standard are saying that it is applicable to "electrical and electronic apparatus". In our case industrial machine consists of several devices (apparatuses), like VFDs...
  13. PaulBr

    IEC frame size motor terminal boxes and imperial size conduits

    Does anyone has recommendations how to connect imperial size conduits to metric sizes openings in motor terminal boxes. Machine is being built in China. All motor equipment is using IEC motors with metric size openings terminal boxes. However all conduits and fitting required to be PVC coated...
  14. PaulBr

    PowerFlex 525 and 753 current rating.

    Jraef, I've actually noticed it with PowerFlex 525. Frame D and E of 380-460V all have output current higher than input current. PaulBr.
  15. PaulBr

    PowerFlex 525 and 753 current rating.

    We have started using new families of Rockwell Automation drives, PowerFlex 525 and Powerflex 753. In the drives manual there is chart that showing drives input current rating and output current rating. On these charts output current rating is greater than input current rating. It is opposite...
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