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  1. whycliffrussell

    Modicon Micro AEG 110 CPU 331 00

    I'm not a PLC expert. Any idea who makes the unit in the subject line? Schneider perhaps? I am looking for an operator/installation manual for the unit as i want to bring back a couple of 4-20mA flowmeter outputs to the unit, and i want to know what the unit's capabilities are. Plus I need to...
  2. whycliffrussell

    Generator Relay Burning Out

    I have a client with a 100kW, 600VAC, Caterpillar SRCR generator set that they are having some problems with. I don't have much information on the unit only a wiring diagram that I have attached. Through a telephone conversation with my client I have gathered the following details on what is...
  3. whycliffrussell

    Electromechanical Relays for Hazardous Locations

    I am looking for a single pole double throw electromechanical relay for: Class 1, Zone 1, Gas Group IIC OR IIB+H2, Temp Code at least T3. It needs a 120V coil. Contacts rated at at least 120V and 8A.
  4. whycliffrussell

    Rectangular Busbar Inductance Calculations

    Does anyone know of a reference guide the busbar inductance calculations. I have a guide for tubular (circular hollow bus bar) but not for solid rectangular bus bar. I cannot seem to dig up anything online regarding this type of calculation. Is there an IEEE or Mfg. reference that covers this?
  5. whycliffrussell

    Lighting Design for Television Broadcasting - General

    I'm a designing a lighting system for council chambers at a city hall. The council chambers are to have several TV cameras to broadcast council proceeding on the local community channel. Can someone point me in the direction that I should proceed on this design (as I am not a lighting...
  6. whycliffrussell

    Arc Resistant Switchgear

    What does arc resistant switchgear do with respect to mitigating arc flash hazards? I know, qualitatively it reduces the risk an an arc flash incident, but how may this be quantified with respect to calculating arc flash hazards? For instance, if I have a switgear lineup that has an arc flash...
  7. whycliffrussell

    bunker C + class III?

    Is bunker C considered a class III liquid by API? If so, is this explicitally stated in API 505?
  8. whycliffrussell

    UPS + Cold Weather Conditions

    I am looking for a mfg. for a UPS rated for -25 deg C - Has anyone ever come across this before?
  9. whycliffrussell

    Negative Sequence Reactance

    why is the negative sequence reactance different than the positive sequence reactance for rotating machines?
  10. whycliffrussell

    NFPA Arc Flash & FPB

    When calculating the the flash protection boundary (FPB) it is based upon the panels of the equipment removed (ie: someone has the covers removed working on it). Is the FPB different if the covers on the the equipment? ie: do they terminate at the surface of the enclosure if the covers are on?
  11. whycliffrussell

    NFPA Arc Flash - Table 130.7(C)(10)

    Can anyone tell me what 'AL = Select one in group" means in this table? ie: does it mean select EITHER safety glasses OR safety goggles? Additionally, what do the "-" indicate?
  12. whycliffrussell

    Electrical Hazard Classification for Asphalt Handling Areas

    I am doing an electrical hazard classificaiton for a bulk storage and offloading facility. One of the products is ashpalt. What is the hazard classification for asphalt? (North America)
  13. whycliffrussell

    Coax-to-Fibre & Fibre-to-Coax Converter

    Hey Guys: I am looking for a Coax-to-Fibre & Fibre-to-Coax Converter for a CCTV application (distance from the video camera to the video server is too long for coax...approximately 500m). I'm using a PELCO dome camera which uses either RG59/U, RG6/U or RG11/U coax, and an eithernet video...
  14. whycliffrussell

    AutoCAD + VBA + Find

    Ok. I have a list of text strings that I want to search for in multiple .dwg drawings in a directory (the text can either be in .txt or .xls format). Is there a way to use VBA to sequentially search through each drawing and zoom to the text in in the list one at a time? (having the user hit...
  15. whycliffrussell

    merging word documents with vba

    i have multiple word documents that i want to combine/merge using vba. doc a doc b doc c i would like to combine them such that doc a is at the beginning, and either a section or page break is inserted, then doc b will then follow the section/page break, then another section/page break, then...
  16. whycliffrussell

    Intrinsically Safe Barriers

    I am looking for a low impedance (less than 20 ohms) dual channel intrinsically safe zener barrier. The barrier has to be rated for CSA class I, zone I OR class I, div I, hazardous rating classification. The zener barrier is to be supplied by a 7.5VDC 1.5A power supply, and must be capable of...
  17. whycliffrussell

    Arc Flash & GE AK-50 Circuit Breaker

    I'm doing an arc flash study, and according to ETAP if I delay the LSIG settings and increase the pickup time on a GE AK-50 (1600A frame) breaker the arc flash will increase - the converse is true if I turn down both of the settings... Somehow this does not seem correct to me? ie: The CPT of...
  18. whycliffrussell

    magnetic duct

    For the purposes of short circuit calculations does anyone know if teck cable is considered 'magnetic duct' (due to the fact that it is encased in metallic armor)?
  19. whycliffrussell

    transformer sequence impedances

    I have a transformer (46kV to 4.16kV) with impedance z% of a delta wye, resistence grounded transformer with neutral grounding resistor zn. The positive and negative sequence impedance = z% Does the zero sequence impedance=z% + 3*zn% where zn% is zn represented on a per unit basis on the the...
  20. whycliffrussell

    Transformer

    I am looking for: Transformer 30kVA, 600:120/208VAC, 3 phase, delta-wye gnded class 1, zone 2, group IIC hazardous area classification T3 temperature rating OR Class 1, div 2, group b hazardous area classification Can you supply this? Can you supply it in oil-filled? T3 temperature rating...

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