Forum Posts

• May 18, 2020 6:02 PM PDT

  in the topic 125A main lug panel in the forum Electrical Engineering

  Hi everyone, A main panel contains a breaker of 80A to feed a 125A main lug panel. If I am not wrong, NEC 215 allows this?
• April 27, 2020 11:28 PM PDT

  in the topic HV room in the forum Electrical Engineering

  The  HV cable are coming to the HV room through raise floor. Should the HV cables in raise floor be directly laid or in a cable tray.  
• January 19, 2020 2:38 AM PST

  in the topic Transformer impedance in the forum Electrical Engineering

  Due to full load there is always voltage drop to the winding resistance and leakage reactance. This is called Z%. This impedance represents the amount of normal primary voltage that should be applied to the transformer to produce full rated load current when the secondary winding is short circuited. The maximum short circuit current that can be obtained from the output of the transformer is limited by the impedance of the transformer and is determined by multiplying the reciprocal of the impedance times the full load current. This post was edited by Ronnie Rana at January 19, 2020 2:38 AM PST
• December 26, 2019 8:45 AM PST

  in the topic NEC 277v motors in the forum Electrical Engineering

   Motors rated at 277 volts are not as common as other voltages but are sometimes used within equipment that has an overall nameplate. The equipment nameplate value can be used in that situation as stated in 430.6(A)(1) Exception No. 2. If being installed as a separate motor make sure all of the other applicable rules of Article 430 are complied with, including 430.7. If there is no table value given in the NEC then the only choice is to use the nameplate value or get the value from the motor manufacturer.
• December 12, 2019 1:36 PM PST

  in the topic Electricity theft in the forum Electrical Engineering

  Hello everybody.I have been living in the same house for 7 years now.In the first six years I used a total of 15,000 kWh. That is an average of 2,500 kwh per year. Everything was always fine and good.In March 2018, a new   meter was installed due to renovation work.Since February 2019 I have been using around 8,000 kWh a year according to the electricity provider.I have now noted the shower time every day, what goes on for how long, etc.but the power consumption does not seem some how correctlyYesterday I was not taking a shower for the test, no washing machine. Only an oven ran for an hour. But no light, no PlayStation or anything else. I used 15 kWh again.Yesterday evening 8 p.m. until 8 am this morning again 8 kWh although we only slept and nothing was running.How can I prove something is wrong?I got all the fuses out at 9 a.m. and I'm curious to see if the meter continues to run