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  • Users: mel127
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  1. mel127

    neutral conductor on a separate conduit?

    We are planning to install 2 additional neutral conductors on a 3 phase, 5 KV circuit (2 circuits for redundancy). The conductors are underground. The entire run will cover 11 manholes at about 3000 feet. We are looking at different options and the correct way to do it. First option is to pull...
  2. mel127

    need help of transformer vendor

    Does anyone know of vendors that can supply padmount transformer 1500 KVA, 34.5KV delta - 480Y/277 secondary, copper both windings, padmount or substation type will do? We are trying to support the relief efforts in Haiti. This transformer will power up the berthing barge(suppose to come in the...
  3. mel127

    cable overheating

    Greetings, We have a problem of overheating cable/conduit here. We have 3 sets of wire coming from the swithcgear on the control room. The 4" conduit that is penetrating the flooring is overheating. Cables are installed one conduit for each phase? Is the conduit acting as a CT that is it is...
  4. mel127

    dc rating of NF panelboard

    Greetings, I have a spare NF panelboard(new one) and I would like to make good use of this for our DC application (120VDC) but I cannot find the rating of this panelboard. Does anyone here have any idea on the DC rating of this panel?
  5. mel127

    fiber optic backbone

    Greetings, I am not familiar with FOC that's why im posting this question. Can someone provide me with a basic materials/equipment to provide a FOC backbone to various locations.The FOC run is approximately 10 miles with 21 individual buildings serve.This will be done overhead to save extra...
  6. mel127

    tips on FAT

    Greetings, My boss will be sending me to attend a FAT for the Medium voltage switchgear we are about to install.The thing is, this will be my first time to attend this. Can you provide me tips of what i will be expecting?I am now starting to gather informations from NETA and other publications...
  7. mel127

    OPGW wire

    HI All, There is an ongoing construction to build a ballfield. Steel poles are being installed for the lightings and it was found out that these poles are near the transmission lines.(about 4 feet). Our best option is to install new poles parallel to the existing to meet the code requirements.My...
  8. mel127

    muse generator sound proofing

    All, Any suggestions on how to sound proof or minimize the noise coming from 3 muse generators(1500kw each).We are thinking of installing a 20 feet wall around the perimeter but I know if this approach is the best.Maybe one of you already encountered this kind of problem. These DG's are in close...
  9. mel127

    busway question

    Greetings, We are on the process of upgrading various equipment(switchgears,busducts,generator controls,etc) to better improve the system.But due to budget concerns the management tried save something like instead of totally replacing the busways (3 phase , 3000 Amps , 4160V) they are pursuing...
  10. mel127

    All about PT's

    Greetings, We are on the process of upgrading various components on our substations which was built when I wasn't even born. We tried contacting vendors and suppliers for them to recommend a replacement for PT's.They come out with a lot of queries: 1. Location of application - Outdoor type 2...
  11. mel127

    lightning arrester

    Greetings, The past two occasions we encountered two blown out lightning arresters(due to old age).The arrester was made by Westinghouse , 30 KV application , type SV Autovalve with style no. 1594748. What do you recommend to replace this obsolete arresters? And also can we trace what year did...
  12. mel127

    conduit issue

    is there any violation if someone is using a sch.80 PVC intended for water piping to be used in electrical application?
  13. mel127

    effect of motor change out

    Good day, We received an order to replace a 300Hp,460V,3 phase,1750 RPM with a 150Hp,460V,3 phase,1185RPM.My question is what will be effect of these motor change out in terms of pressure and some other parameters.By the way the motors are being used in refuelling tank and distributing to other...
  14. mel127

    Communication manhole grounding

    Is GROUNDING necessary for Communication manholes(concrete type)? Thanks in advance.
  15. mel127

    manhole clearance from roadway

    Good day...Im trying to find out the standard distance of manholes(i mean electrical,communication,sanitary/sewer) from the edge of the roadway. I'm kind of new to this work and trying to get important information concerning this. Existing distances I see around is 4 feet but I want to make sure...

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