Mike Dolt Enterprises
Mike Dolt Enterprises
User: bhombal1, Location: Tennessee
Asked on: Tuesday, April 5, 2011 at 1:03 am EDT
Answered on: Tuesday, May 14, 2024 at 3:46 am EDT
Question: Please help me. I have a small laundromat with a 400amp 3phase service. my service Amp load on my 3phase equip is 63amps and on my singlephase 120v equip is a total of 338amps@120volts. so its 63amps + 338=401amps plus an additional lets say 100amps for lights and 1A/C. Now im doing an addition and adding only 5amps of light, another A/C maybe 30amps and 5 stackdryers@ 16amps each and 9 washers which are add upto 51amps 3phase...so the total for new equip will be equal to another 51amps 3phase and 115amps single phase=166 total amps.when combined the old and new---it will be 114amps at 3phase + 553amps single ph which equals to=667amps total...my contractors electrician seems is gonna bail out. the city inspectors passed everything except electrical---they want the Load calculation done before inspecting and the electrician doesnt seem to know how to do it....so my question is---will my electric service is adequate enough? and how or who can do load calculations for me in dallas, tx? PLease Please help me---everyone i talk to and read on the net says i have enough electrical---i need someone who is very knowledgable to a give me an answer.....please.
Load Calculation
Your current load is 63 amps (3-phase) + 338 amps (120V) + 100 amps (lights and A/C) = 501 amps total.The additional load you are adding is 51 amps (3-phase) + 115 amps (120V) = 166 amps total.Combined, the new total load is 114 amps (3-phase) + 553 amps (120V) = 667 amps total.
Service Capacity
Your service amp load is 400 amps.According to the National Electrical Code (NEC), the maximum load allowed on a 400 amp service is 80%. Therefore, the maximum allowable load is:400 amps x 0.80 = 320 ampsConclusion
Your combined load of 667 amps exceeds the maximum allowable load of 320 amps on your 400 amp service. This means that your current electrical service is inadequate to handle the additional load.
Options
To address this issue, you will need to either: Upgrade your electrical service to a higher capacity
This will require contacting your utility company and installing a larger service.
Reduce your load
This may involve reducing the number of appliances or machines you are using or installing more energy-efficient equipment.
Load Calculation Services
You can find licensed electricians in Dallas, TX who can perform electrical load calculations for you. Some reputable companies include: Benson Electric
https://www.bensonelectric.com/
Davis Electrical
https://www.daviselectrical.com/*
Duran Electric: https://www.duranelectric.com/These companies can help you determine the required electrical service capacity for your business and provide you with a detailed load calculation report. Flag for review