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Electric service of 120/208 Volt ,3 phase ,4 wire ,1200 amp
Electric service of 120/208 Volt ,3 phase ,4 wire ,1200 amp capacity is ground fault protection required or recommended for a large auto service facility ? … read more
Kevin
Kevin
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I'm trying to figure out how many amps can I run from an 75
I'm trying to figure out how many amps can I run from an 75 kva floor transformer working from a 480v 3 phase feed line to a load on 208/110v… read more
Sam I
Sam I
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I have an electrical panel with main breaker that reads
Second opinion] I have an electrical panel with main breaker that reads "600A, 3 phase 120/240v (delta symbol)" I need to calculate how many 6A @220v computer devices can safely run off of this electr… read more
Kevin
Kevin
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We are moving into a new warehouse and the owner said it has
We are moving into a new warehouse and the owner said it has 480 volt power supply coming in. He said it is 3 phase has "400 branches". Does that mean three 400amp branches? How many amps can I safely… read more
Kevin
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How do I calculate Voltage Drop 250 watt lights 200
How do I calculate Voltage Drop for 10 250 watt lights 200 apart using 240/480 single phase 3- wire (alternating phase) system?… read more
Steve G.
Steve G.
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I want to run a spa that's probably a little over 200' from
I want to run a spa that's probably a little over 200' from the main panel. The previous spa owner had a 50 amp breaker on it, so I was considering using 6/3 + ground to provide power. The first 90' o… read more
Kevin
Kevin
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310.15()(7)(1) 83% of the service equipment (meter, main,
310.15(B)(7)(1) 83% of the service equipment (meter, main, load center) rating, or 83% of the load calculation?… read more
AssuredElectrical
AssuredElectrical
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High School or GED
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Time sensitive NEC electrical sizing question Hi, I am getting
Time sensitive NEC electrical sizing question Hi, I am getting quotes for a large service being delivered. The service is for max rated 400 amps(2 200 amp breakers) of 208v power (three phase), or 144… read more
AssuredElectrical
AssuredElectrical
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We are working on a datacenter build-out using a 400 amp 480v
We are working on a datacenter build-out using a 400 amp 480v three phase service from the electric company, and would like to know the following: Is there 400 amps available on each phase? If using s… read more
AssuredElectrical
AssuredElectrical
Master Electrician
High School or GED
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I need to feed a 200 AMP disconnect switch from a 400 amp,
I need to feed a 200 AMP disconnect switch from a 400 amp, 3 phase panel, then install conductor 200' to another panel on a skid. the 200 amp, 480 vac, 3 phase skid panel has a total full load amp loa… read more
Jason
Jason
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I am preparing to purchase equipment to power a warehouse.
I am preparing to purchase equipment to power a warehouse. I have a utility supplied outdoor tansformer 13,200 volt 480 Y /277 3ph that goes to an outdoor distribution box and outdoor wall mounted rac… read more
Joseph
Joseph
743 satisfied customers
I have an existing 1200 amp single phase 120/240 volt service.
I have an existing 1200 amp single phase 120/240 volt service. CT metered next to the transformer, 80 feet of 4/0 paraleled in pvc underground to a gutter with 6 200 amp 10,000 aic mains feeding the b… read more
Rich
Rich
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Vocational, Technical or Trade Scho
1,117 satisfied customers
WE have a 1500 KVA transformer with a distribution panel that
WE have a 1500 KVA transformer with a distribution panel that has four 800 amp breakers and one 225 amp breaker with no main breaker. We are under the 6 breaker rule but over the ampacity of the trans… read more
Mike G.
Mike G.
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Vocational, Technical or Trade Scho
8,290 satisfied customers
There is 400A branch breaker has 80% rating of load at 100%
There is 400A branch breaker has 80% rating of load at 100% of the time. And this breaker feed to the panel for equipment has main 400A breaker has 80% rating at 100% of the time. What size copper cab… read more
electrifier
electrifier
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Hi, im wondering whats involved in upgrading an existing 208
Hi, i'm wondering whats involved in upgrading an existing 208 volt 1200amp 3 phase service to a 460-480 volt service?… read more
Sir Sparks
Sir Sparks
Owner
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I have 480 volt 3 phase power that I need to connect to a portable
I have 480 volt 3 phase power that I need to connect to a portable building. I need a 200 amp 3 phase fusable disconnect on the exterior of the building. From there I plan to enter a 480 volt 3 plase … read more
Sir Sparks
Sir Sparks
Owner
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2,519 satisfied customers
I have a 400amp. service panel,its feeding four transformer,they
I have a 400amp. service panel,it's feeding four transformer,they are 15kva,75kva,150kva,75kva.how do the calculation to see if there max out.(up to 80%) I want to know if upgrade is needed… read more
electrifier
electrifier
Master Electrician
Bachelor's Degree
1,458 satisfied customers
Trying to find the total amperage usage in an circuit breaker
Trying to find the total amperage usage in an circuit breaker box rated at 480 volts! Do I take amp readings of all 3 phases (a+b+c=?), add them together to find the total amps, or do I just use one o… read more
Rich
Rich
Master Electrician
Vocational, Technical or Trade Scho
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Meet the Experts:

Mike

Mike

Master Electrician

1,426 satisfied customers

Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer

Jason

Jason

Service Technician

3,958 satisfied customers

Over 20 years of experience in all types of installations, troubleshooting, and repairs.

Mike G.

Mike G.

Master Electrician

8,290 satisfied customers

Proven Professional 49 years Experience

Kevin

Kevin

Licensed Electrical Contractor

4,414 satisfied customers

31 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC Technician License

AssuredElectrical

AssuredElectrical

Master Electrician

3,264 satisfied customers

Contractor-42+ Years in the ElectricalTrade

electrifier

electrifier

Master Electrician

1,458 satisfied customers

Electrical contractor and electrical inspector for over 24 years with phone and networking expertise

Rich

Rich

Master Electrician

1,117 satisfied customers

Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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