Electrical

Electrical Questions? Ask an Electrician Online.

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

Hope all is well. happy New Years. I will be installing a 30…

Hello Jason. Hope all is...
Hello Jason. Hope all is well. happy New Years. I will be installing a 30 amp breaker for a audio amplifier. My service panel doesn't have a ground. I'm planning on using a 10/3 cable. What should I do with the ground cable?Also, is this considered a floating ground? What problems can arise when not having a proper ground?
Show More
Show Less
Ask Your Own Electrical Question
Answered in 3 minutes by:
1/17/2018
Jason
Jason, Service Technician
Category: Electrical
Satisfied Customers: 4,303
Experience: Over 20 years of experience in all types of installations, troubleshooting, and repairs.
Verified

Hi Johnny. I am doing well. Thanks for asking. Is there no ground wire included in the wires feeding the service panel?

Ask Your Own Electrical Question
Customer reply replied 4 months ago
No this is actually a sub panel about 100 feet away from the main entry and doesnt have the ground coming from the main.

You could use a volt meter to take a reading from one of the live feed wires to the metal enclosure of the sub panel (assuming the feed is in conduit for the entire run between panels). If you get the same reading you get when testing between a live and the neutral, the metal enclosure of the sub panel is grounded by the conduit.

Ask Your Own Electrical Question

In that case you could install a ground lug that would be bonded to the metal enclosure of the sub panel, then connect your load ground to this lug.

Ask Your Own Electrical Question

On audio systems, grounding is very important. I would add a ground wire to the run between panels if necessary, to get a good ground path for the load. Or, feed the load from the main panel, if a ground is present in that location.

Ask Your Own Electrical Question
Customer reply replied 4 months ago
Jason I didnt remove the front panel at but what I did was put the positive probe to an outlet thats being fed from the panel and the negative terminal touching the box the outlet is in and I get 125vac also I touch the actual side of the panel and get 125vac. We still don't know if they connected the neutral or grounded the panel from the main correct? I will most likely have to remove the front and see physically correct?

I would want to know about the feed between panels, so my recommendation is to open the sub and look inside. If possible, posting a photo here would be helpful for me.

Ask Your Own Electrical Question
Customer reply replied 4 months ago
Ok I will post tomorrow by the afternoon.

Looking forward to it. I'll reply as soon as I get home from work. Have a great night.

Ask Your Own Electrical Question
Customer reply replied 4 months ago
Jason it appears that the conduit bringing the main into this sub panel has a ground lug connected to it. I measure voltage from one of the hot metal blades and to the ground on the left hand side and I get 127vac.I also used the outside of the panel as ground and one of the hot metal blades and get 127vac.Is this normal practice to ground the panel? I'ma little concerned. Is this safe.
20180118_150056.jpg2018011...jpg20180118_150051.jpg2018011...jpg20180118_150036.jpg2018011...jpg20180118_145601.jpg2018011...jpg20180118_145556.jpg2018011...jpg

Actually, this is a proper and acceptable installation. When metal conduit is installed for the entire length of a feed between a main panel and a sub panel, and there is a proper grounding bushing in place, the conduit is allowed to act as the grounding conductor. I wouldn't be worried about this at all. But it wouldn't be a bad idea to install a ground bar, which should be bonded to the back of the metal enclosure in the photos.

Ask Your Own Electrical Question
Customer reply replied 4 months ago
Jason when I put a ground bar will it be safe to remove the ground cable from the lug to connect to the ground bar while everything is live?

There really isn't any reason to disconnect the ground cable from the ground lug. In fact, doing so would potentially remove the bond between the metal conduit and the enclosure of the sub panel. Simply install a ground bar that is screwed to the back of the enclosure, making direct metal to metal contact. Then, any load grounds you add to the sub panel can be connected to the new bar.

Ask Your Own Electrical Question
Customer reply replied 3 months ago
Can you send me a picture of what your asking me to do?

The photo marked 3.3 on this page shows a ground bar on each side of a panel. You can see the one on the left a little better.

Ask Your Own Electrical Question

If you screw a ground bar directly to the back of the panel in this way, any load grounds you connect to it will then be common to the conduit between the main panel and the sub panel.

Ask Your Own Electrical Question
Customer reply replied 3 months ago
Ok so since the ground lug is connected to the side of the panel by screwing the a new ground bar like in the picture the ground bar will be grounded as well. Correct?

Yes, that's correct. The enclosure of the panel is acting as a bonding point. Perfectly legal and safe.

Ask Your Own Electrical Question
Customer reply replied 3 months ago
OK thanks.Will this link below work?https://www.homedepot.com/p/Eaton-14-Terminal-Ground-Bar-Kit-GBK1420CS/100199885

Yes, that bar is a good one to put in the sub. You may have to drill and tap one or both holes for mounting, if the spacing of existing holes isn't right for this bar, but that's pretty easy to do.

Jason
Jason, Service Technician
Category: Electrical
Satisfied Customers: 4,303
Experience: Over 20 years of experience in all types of installations, troubleshooting, and repairs.
Verified
Jason and 87 other Electrical Specialists are ready to help you
Ask your own question now
Customer reply replied 3 months ago
OK thanks.

Happy to help. Is there anything else I can do for you at this time?

Ask Your Own Electrical Question
Customer reply replied 3 months ago
No at this time. I might follow up with you when I'm about to do it.
Was this answer helpful?
Ask Jason Your Own Question
Jason
Jason
Jason, Service Technician
Category: Electrical
Satisfied Customers: 4,303
4,303 Satisfied Customers
Experience: Over 20 years of experience in all types of installations, troubleshooting, and repairs.

Jason is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

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

4,303 satisfied customers

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

Mike G.

Mike G.

Master Electrician

7,826 satisfied customers

Proven Professional 48 years Experience

Kevin

Kevin

Licensed Electrical Contractor

3,870 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

1,115 satisfied customers

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

< Previous | Next >

Related Electrical Questions
can you install electrical outlets into an existing concrete
can you install electrical outlets into an existing concrete slab? If so, how?… read more
Rich
Rich
Master Electrician
Vocational, Technical or Trade Scho
1,115 satisfied customers
the gf breaker keeps tripping on a smoke alarm circuit. The
the gf breaker keeps tripping on a smoke alarm circuit. The code or so I'm told requres the installation of a ground fault breaker in any smoke alarm circuit. This really makes no sense because any ty… read more
electrifier
electrifier
Master Electrician
Bachelor's Degree
1,458 satisfied customers
You need to add a piece of 3/4-inch rigid conduit between a
You need to add a piece of 3/4-inch rigid conduit between a section of conduit that ends at a distance of 5 feet from a wall and an outlet box that,s located 4 feet up the wall.If you,re going to thre… read more
electrifier
electrifier
Master Electrician
Bachelor's Degree
1,458 satisfied customers
IN 2" CONDUIT WITH 10 10 CAT 6 CABLES IN SIDE ALONG THE WAY
IM PUTTING IN 2" CONDUIT WITH 10 10 CAT 6 CABLES IN SIDE ALONG THE WAY THESE 10 CABLE BRANCH OFF TO A BUILDING WHAT TYPE OF IN GROUND HAND PULL BOXES DO I NEED TO HAVE AT THESE AREAS WHERE THE 2 CABLE… read more
David Bowden
David Bowden
Owner
839 satisfied customers
CAN I RUN 1 MAIN 2" CONDUIT WITH A 2", PVC Pipe, Wye
CAN I RUN 1 MAIN 2" CONDUIT WITH A 2", PVC Pipe, Wye Schedule 80, Slip TO BRANCH A LINE OFF TO ANOTHER BUILDING ALONG THE PATH WAY SO I HAVE 4 BUILDING AND I WANT TO RUN CAT 6 TO THEM FROM ANOTHER BUI… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
3,870 satisfied customers
1. According to the NEC, conduit seals are required within
1. According to the NEC, conduit seals are required within _______ inches from a pressurized enclosure when the conduit is not pressurized in Class I, Division 1 protection systems. A. 24 B. 30 C. 12 … read more
Chris Miller
Chris Miller
Social Worker
Master\u0027s Degree
100 satisfied customers
Installing an exterior outlet next to my back door...the
Installing an exterior outlet next to my back door...the line feed is from the load side of a gfci outlet in the same circuit so I'm using a regular receptacle in an exterior square box and feeding th… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
I swapped out an outlet like for like and the gfi outlet is
I swapped out an outlet like for like and the gfi outlet is tripped. It makes no sense to me. … read more
David Bowden
David Bowden
Owner
839 satisfied customers
Underground conduit cover" First time. Depth of conduit.
depth of conduit. table 300.5 measures from the top of conduit to top of finish surface and the inspector measures from top of the conduit to the bottom of the concrete slab. wish is correct?… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
3,870 satisfied customers
I'm building a detached shop and need to get conduit in the
I'm building a detached shop and need to get conduit in the ground for the shop electrical panel. I have a 200amp main panel in the house that is about 50 ft away from where the shop panel will be. … read more
Sam I
Sam I
Electrician
B.S.
644 satisfied customers
I am trying to add an outlet and a switch for that outlet.
I am trying to add an outlet and a switch for that outlet. The power goes through to other areas. So basically I have power coming to a junction box, one of the wires coming out of the junction box goes to a light ( the old pull style). I wan to replace that old light with an outlet and have a switch for that outlet only. clear as mud right? LOL … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
When using a metal conduit body such as an LB, or capped L
When using a metal conduit body such as an LB, or capped L at an enclosure does that fitting need to be supported other than with the nipple into the enclosure? … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
What are the construction requirements for a new conduit
What are the construction requirements for a new conduit installation to an existing building? … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
What type of wire does PG&E require to be buried in conduit?
what type of wire does PG&E require to be buried in conduit? The Distance would be close to 400' Will a single wire be able to go that distance or will I need a secondary? How many wires will be in th… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
Is it permissible to run romex wire through conduit indoors
Is it permissible to run romex wire through conduit indoors and in a dry location? … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
How do I install a floor mounted outlet in a basement? I am
How do I install a floor mounted outlet in a basement? I am thinking of making a trench in the concrete floor, running conduit to where the outlet will be, and then re-cementing the floor. Any ideas?… read more
JCCARVER
JCCARVER
8 satisfied customers
My house was built in 1959; no ground wires, no mental conduit.
My house was built in 1959; no ground wires, no mental conduit. I have read several of your answers on this subject and it seems that GFIs are the best solution. But from a technical point of view wha… read more
AssuredElectrical
AssuredElectrical
Master Electrician
High School or GED
3,264 satisfied customers
I'm trying to hook up a 70 -2 amp breaker box. I will be
I'm trying to hook up a 70 -2 amp breaker box. I will be installing 4 15 amp breakers in the 2 slots. The feed wire is coming from a 30 amp breaker from the main box. The wire was for a 220 outlet ori… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
3,870 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x