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voltage drop

  1. General Electrical Discussion
    So I have had an ongoing issue in my house with lights dimming. For example when my wife runs her hair drier in the bedroom the lights dim in the entire house. Or when we run the coffee maker. Or when the a/c kicks on. Etc. We had the power company come out twice and run tests and all is good...
  2. Canadian Electrical Forum
    Wondering about the rules on this. House load is about 60 Amps but plan on adding a future garage/shop. Here's the info I have: Transformer to meter on the house is 360 ft buried. cable is 3c 4/0 aluminum Regular 240 v service for the house load is 60 A for now Inspector came through and...
  3. Tools, Equipment and New Products
    I mostly work residential in a gentrifying city -meaning lots of old panels & meters, loose bugs, crappy grounding. I get a lot of situations where 1 leg of the service entrance isn't working/intermittent arcing. I'm looking for recommendations to get a *voltage logger* to see if problems are...
  4. Tools, Equipment and New Products
    I have been involved in a project where I am reading the 120 V coming from a supply. Since input is AC, firstly I converted it to DC using full bridge, now that I used a voltage divider. I am using two resistors one of 20 k and otherone with 800 ohm, As per this VDR calculator for input of 120...
  5. General Electrical Discussion
    I haven't had much experience troubleshooting 3-Phase motors. Recently received a service call to look at a meat grinder that uses a 3-Phase 120/208V motor. The customer stated that they had someone out there to repair the machine because the motor was not running just humming.The tech stated...
  6. Residential Electrical Forum
    Hi there, I was going to wire a couple temporary sea cans up for the winter. I am unable to go from the main building to the lot with the sea cans underground because of a gas line. So I will be going overhead. I guess I just have some questions about that. Its a commercial building. I was...
  7. General Electrical Discussion
    Received a service call that some counter top outlets were not working. Get to the house and realize that it was just a tripped breaker and figured it was just a simple call. While I was there I figured I would do a voltage reading to make sure that there wasn't a problem with the receptacles...
  8. Commercial Electrical Forum
    I have 4-10 ton, 460v 3ph RTU's in a row. am wanting to hit 2- RTU's with one raceway. There would be 7 current carrying cunductors.( 2- 25 amp MCA, circuits plus a 120v service recept in each conduit) the longest run is 275'. the other is 235' I know how to calculate for VD but im sketchy on...
  9. General Electrical Discussion
    I am bidding electrical for the installation of several RTU's they are 10 Ton units, MCA 50, MAX fuse or HACR breaker 60. Some of the RTU's are 200 to 360 feet from the service. At one point in time, VD was a FPN, and now its not even in there but im in the habit of calculating for it. I would...
  10. General Electrical Discussion
    The new Ontario ESA VD requirements since febr 2014 are allowing a max of 38m for a 15Amp breaker. Does it make sense to put a pony panel in the center of the house, than running the risk that the runs are too long? Opinions on this would be appreciated. Jacob
  11. General Electrical Discussion
    Hey guys, I'm doing a private residential job and am having troubles figuring something out. I'm running a 60 amp subpanel off of the 200 amp panel. I'm planning on using NMD90 6/3 rated at 90 degrees. (copper) I'm in Canada. What is the acceptable voltage drop to a subpanel? 3%? 5%? By my...
  12. Tools, Equipment and New Products
    In my quest to spend ever more money on new gadgets I have decided it's time for an AFCI tester! Plus, this may save some time with voltage issues in trouble shooting; in the past year I have been called 4 or 5 times and done a visual inspection to find burnt up lugs or connections ...I'm not...
  13. General Electrical Discussion
    This may be sound a little stupid but I need to ask. - I have a customer that complained of bulbs going out prematurely and I checked the voltages coming into the house and everything seems fine. I understand that a loose neutral, (or perhaps a hot too), will cause some voltage fluctuation and I...
  14. General Electrical Discussion
    Hi guys. It's been awhile since I posted here. I have set up a Load Schedule and a Voltage Drop Calculator in my company website. They save me a lot of time, and I thought some of you might like to use them. Here are the links: Residential Load Schedule Calculator...
  15. General Electrical Discussion
    Recently did a 200 amp residential upgrade on a house. Part of the reason for the upgrade was the customer wanted a 19kw :eek: point of use heater for under the kitchen sink. This unit requires 2 independent double pole 40amp breakers. The unit works fine except when it is on, some (not all)...
  16. NEC Code Forum
    Trying to wrap my head around this one... When calc voltage drop, should I always use the available load (rated panel) or just use my calc load - what I'm gonna install. I've gotten into with electrical engineers before. What do you guys/girls think?
  17. General Electrical Discussion
    I'm working on an old mobile home with a 120/240v service. When the 120v microwave is energized, the line voltage on that leg drops from 120v to 110v. On the other leg, the voltage rises to 130v both at the panel and on other circuits. The main breaker is on a pole outside about 15 feet away...
  18. Commercial Electrical Forum
    I'm wiring a small marina (22 slips, 2 houseboats, 1 bathroom and some lighting) and having some trouble sizing feeders. The houses are at the end of the dock, about 1000' from the service, and each gets a 100a 120/240 single phase feeder. There will be several pull or junction boxes along the...
  19. Commercial Electrical Forum
    i know how to do a voltage drop calc if the load is x feet from the panel, but i am trying to do a calc for some outside lighting need some help. from the building i come out to a jbox and go one way to 4 building up lights, from the jbox i also feed out to 4 pole lights. how do i do that...
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