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69 entries.
Matt Lockyer Matt Lockyer wrote on September 25, 2019 at 6:18 AM:
Thanks for the information regarding access. I have another query if I may - this time asking for "server".
Admin Reply by: Ver Pangonilo
Server is localhost
Paul Torres Paul Torres wrote on September 23, 2019 at 12:31 AM:
Hi Sir,
I just want to ask how to solve series open faults.

1. One conductor open fault - Boundary conditions are the same with L-L-G fault. Does it mean that the way to solve one conductor open fault is the same as L-L-G fault?

2. Double conductor open fault - Boundary conditions are the same with L-G fault. Does it mean that the way to solve two conductor open fault is the same as L-G fault?

The source of the formula & conditions which I am referring was posted on below site.

Admin Reply by: Ver Pangonilo
I have discussed open circuit faults in my article Open Circuit Faults, https://pangonilo.com/2010/01/open-circuit-faults.html
Matt Lockyer Matt Lockyer wrote on September 17, 2019 at 9:49 PM:
How would you fix or sort an issue to be able to get access back.
Admin Reply by: Ver Pangonilo
Will check and get back asap. All is okay now
Jimmy Leonardo Jimmy Leonardo wrote on August 27, 2019 at 10:22 PM:
Defferentiate the P.E.C to N.E.C
Admin Reply by: Ver Pangonilo
PEC is Philippine Electrical Code, applicable only in the Philippines while NEC is National Electrical Code applicable in the United States. However, PEC was based on NEC but dimensions and sizes were converted into metric.
don rainier abesamis don rainier abesamis wrote on August 14, 2019 at 9:23 PM:
Hi Sir, student from IIEE TSU Student Council. Just wanna ask kung saan po sa PEC yung plus minus 5% voltage tolerance sa end ng distribution. Thanks!
Admin Reply by: Ver Pangonilo
Your question is a little bit vague but you can check these clauses

For Branch circuits, check FPN 4 under (a)(1)
For Feeders, check FPN 2 under (a) (3)

In design, the voltage tolerance maybe assumed to a certain value which is acceptable to the end user. This are usually stated in specifications and datasheets of electrical equipment. As far as I know (I may be wrong) but PEC does not provide anything about voltage tolerances.
RACQUEL REMORQUE RACQUEL REMORQUE wrote on July 22, 2019 at 3:03 PM:
Good day Sir! The water pump motor in our office needs to be rewinded due to very low insulation resistance of the windings. The three-phase motor is 230 V convertible to 460 V. The motor will be used in our new building with 400 V supply voltage. The motor was used at 230 V. Is it possible to just rewind it at 400 V even though it is designed at 460 V? If not, should we just rewind it at 230 V and buy a 400 V step-up, dry-type transfromer or rewind it to 460 V and buy a 400 V step-down transformer? What is the most cost-effective approach Sir? Thank you very much. Hoping for your response on this matter.
Admin Reply by: Ver Pangonilo
Dear Racquel,

As you have not mentioned the size of your water pump motor, rewinding a 230V to 460V will be the most cost-effective. However, ensure that you choose a COMPETENT rewinding contractor to do the job. But, as the operating voltage (400V) is lower than the rated voltage (460V), efficiency will be lower. Long term, I would suggest buying a 400V, 3 phase motor for the application.


John Cox John Cox wrote on June 3, 2019 at 3:39 AM:
Hello Sir, I’m soon to have a home built in the Philippines. All the power outlets I have observed there are of two pin variety, however , I’m wondering how I can ensure that in fact all the power outlets have all three supply cables - Live - Neutral and an Earth connection.
Looking forward to reply.
Thank you, and regards,
Mr John Cox
Admin Reply by: Ver Pangonilo
Depending on the location of your house to be built, there power outlet configuration will vary.

In the Meralco franchise area, power will have a 115V-0-115V. In here you can use the NEMA 6-20R outlet. However, if your house is covered by an Electric Cooperative franchise, your power will be supplied at 230V-0 configuration. In this case two pole outlet may be used but you can still use a NEMA 6-20R outlet if you wish.
Bryan Santos Bryan Santos wrote on May 29, 2019 at 5:44 PM:
Good day sir, what are the possible reasons for the hard starting of the 3 phase generator?
Admin Reply by: Ver Pangonilo
You need to ask your mechanic about your generator engine.
Samuel Samuel wrote on May 27, 2019 at 10:23 AM:
Good day, Engr. Ver, first of all, thank you for the information and tutorials that you have shared, it has been valuable for furthering my EE knowledge. Do you have any additional book recommendations, websites or articles that can help me deepen my understanding of general EE, and power system design and analysis? Thanks!
Admin Reply by: Ver Pangonilo
There are lots of books out there that I could not say which one is best. Just ask Mr Google.

Thanks for the compliments.
Max Max wrote on May 14, 2019 at 7:44 PM:
Sir, your site is very informative for practicing electrical engineers in the Philippines. Thank you for all the compilations in your site.

Just a query, Part 2 of the Philippine Electrical Code. I've checked with IIEE but it's unavailable. By any chance, do you have an e-copy? Thank you very much
Admin Reply by: Ver Pangonilo
Thanks for the compliment.

I only have a hard copy of PEC 2.
michael leonard michael leonard wrote on May 10, 2019 at 9:50 PM:
I am a plan checker and we have a difference of opinion in my company. My stance is the only one who is allowed to stamp and sign electrical and solar is an electrical engineer or a c-10. can you help me prove my case and help me find where to find that rule or law.
Admin Reply by: Ver Pangonilo
As you have not mentioned your project location, I will not be able to answer your query. Thank you
michael leonard michael leonard wrote on May 10, 2019 at 9:45 PM:
I need to know who is allowed to sign electrical and solar plans
Admin Reply by: Ver Pangonilo
Only registered professional engineers with a valid license can sign and seal electrical plans.
maryanne maryanne wrote on May 3, 2019 at 11:47 PM:
good day sir! may i know if a Filipino engineer, a civil engineer for example, could work as an engineer in Australia?
Admin Reply by: Ver Pangonilo
If you are a Filipino Engineer and wanted to work in Australia as an Engineer, then your best option is to consult Engineers Australia (https://www.engineersaustralia.org.au/)
Ibrahim Ibrahim wrote on April 9, 2019 at 12:30 PM:
I am looking for the excel files of the following:
Creating Coordination Curves with Excel
Time-Current Curves with Excel II
Time-Current Curves with Excel III
Time-Current Curves with Excel IV
Admin Reply by: Ver Pangonilo
The tutorial is very comprehensive that you will be able to recreate the excel files itself. A sample application can be downloaded in the download section of my blog.
lilibeth lilibeth wrote on March 25, 2019 at 11:45 PM:
Im a fifth year electrical engineering student from Bulacan, State, University and one of our professor wants us to find a plan, either a commercial or industrial plan with a load rating of 5MVA. Please help me to find a plan. Your response will be greatly appreciated.
Admin Reply by: Ver Pangonilo
Sorry for the late reply. I do not have any industrial plant plans. Thank you
Jade Amolat Jade Amolat wrote on March 9, 2019 at 7:55 PM:
Sir, good day po!

Ask ko lang po, anong provision po sa PEC yung nagsstate ng standards for medium voltage electrical distribution? For example, yung size po ng poles na gagamitin saka po mga wire sizes and other things na need po iconsider para po sa design? marami pong salamat and more power po!
Admin Reply by: Ver Pangonilo
Look at PEC Part II. You may find information in there.
bashir hussein bashir hussein wrote on February 7, 2019 at 7:17 PM:
We have some 6.6kv cells which have been dismantled recently from a substation in which the European standard is used i.e.(6.6kv, 50Hz), now we are planning to install them in different plant where the American standard is used (4.16kv, 60Hz), please advice regarding the possibility of this installation.
Corazon Quintos Corazon Quintos wrote on January 15, 2019 at 11:43 PM:
What is the philippine electrical code to data connection? Thank you
Admin Reply by: Ver Pangonilo
If I understand your question right, you might need to check these clauses

david lopez david lopez wrote on October 28, 2018 at 2:14 PM:
Could you assist me in determining if my PV solar panel system has a safety issue involving a potential arc flash problem. I have investigated several papers on this subject and realize this is a complex voltage/current with complicated calculations beyond my complete understanding. My solar panel system design consist of two PV solar panels generating about 75VDC and 5.0ADC total directly connecting to an electric water heaters' 16ohm heating element through a 40 foot 16AWG cable. Again, my concern is do I have a safety issue here?
Any help via referals, informative articles, or experimental testing performed at these low DC voltages and low DC currents would be helpful.
If I get lucky with a response from you I am more than happy to discuss my somewhat original clever design to use existing setup involving minimum cost.

Thank you
David Lopez

[email protected]
Admin Reply by: Ver Pangonilo
Your electric heater will draw a current from your solar panel at its peak of about 4.6A depending on the time of the day. Regarding your concern about possible arc-flash, a fault occurring at the terminal of your water heater will draw about 375A ideally. As you have not provided the technical specification of your panel, and with the minimal data you provided, I can assume that your solar panel will not be able to generate this amount of fault current. The incident energy will not be sufficient to produce an arc-flash.

IEEE 1584 can guide you on calculating arc-flash.
samuel s. adriatico samuel s. adriatico wrote on September 11, 2018 at 3:23 PM:
Sir Ver,
Thank you for your valuable information and tutorials
Admin Reply by: Ver Pangonilo
My pleasure. Thank you