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TRUSTED BY ROCKVILLE, VA HOMEOWNERS

  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon940
    Verified electrical services reviews

Find Electricians in Rockville

Avatar for J & M Electrical Services
J & M Electrical Services
4.9(
53
)
Electric Vehicle Charging Station Installation - Materials Not ProvidedElectrical Switches, Outlets & Fixtures - Install or RepairElectrical Wiring or Panel Upgrade+10 more

Serving Rockville, VA and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"James came out to price install of a box to plug in my portable generator. After we started talking and me asking questions James was able to give me an outstanding price on a whole house Generac generator with panel upgrade and included a whole house surge protector. They ran into additional costs with running the gas line but James kept to his word and honored the original price! The crew were professional and proficient in their work! Marcie was outstanding with communication and explaining any questions I had! I would definitely recommend this company and would use J&M for any future electrical needs!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+1

Response time1 day
Response rate100%
3 neighbors recently requested a quote
Avatar for Tolliver Electrical LLC
Tolliver Electrical LLC
5.0(
22
)
Electrical Wiring or Panel UpgradeElectrical for Home Addition or Remodel - Install

Serving Rockville, VA and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Offers commercial services

"Tolliver Electrical did a commercial job for me at Fleetpride. (a heavy duty truck parts store) The company did an excellent job in completing the electrical work before the staff reported back to work the following morning. Tolliver Electrical is the only electrical company that I call on for all my electrical needs"
Panel change
Chandelier
Living room
Lights
Response time2 days
Response rate91%
2 neighbors recently requested a quote
Avatar for Rodworks, LLC
Rodworks, LLC
5.0(
12
)
Electrical Switches, Outlets & Fixtures - Install or RepairElectric Vehicle Charging Station Installation - For Business - Materials Provided by ConsumerElectric Vehicle Charging Station Installation - Materials Not Provided+11 more

Serving Rockville, VA and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship, and complete customer satisfaction from start, to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work, and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large, or small the job.

Response time4 hrs
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Star Servco, Inc.
Star Servco, Inc.
4.4(
474
)
Electrical Switches, Outlets & Fixtures - Install or RepairCeiling Fan - InstallElectrical Wiring or Panel Upgrade+4 more

Serving Rockville, VA and surrounding areas

Approved

Super Service Award Winner

In business since 1976

Free estimates

Emergency services offered

"Called and was scheduled for the appointment 2 days later. They called before coming over and actually arrived faster than expected. He was able to determine what was wrong with the door bells and fixed them quickly. He said he would have to trouble shoot the light fixture but suggested changing all 3 of the light bulbs. Well, that was all that was needed. Color me embarrassed. He asked if there was anything else he should look at, which was very nice. We will call them for any future electrical needs."
Panel Replacement
Panel Installation After
Water Heater
Water Heater
Water Heater

+4

Response time1 day
409 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for W B Lightning Rods
W B Lightning Rods
4.6(
369
)
Lightning Protection - Install or Repair

Serving Rockville, VA and surrounding areas

Approved

In business since 2001

Free estimates

Warranties offered

"WB Lightning Rods did an excellent job installing lightening rods on our home. The owner stayed onsite the entire time to supervise the work. He took extra care to plan the rod and cable placement to ensure the proper protection and retain the aesthetics of our home. His crew were knowledgeable, polite, neat and efficient. We could not be more pleased with the results."
lightning protection
 Residential LPS
lightning protection
 Residential LPS
lightning protection

+79

Response time1 day
174 neighbors recently requested a quote
Recommended by97%of homeowners
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Electrical questions, answered by experts

How far you can run underground electric depends on the wire gauge (generally AWG) and the circuit voltage. Too much voltage drop in an electrical circuit can negatively affect performance, so the smaller the voltage drop, the better. Ideally, it shouldn't exceed 3%. The smaller the wire and the longer the run, the more significant the voltage drop. 

For example, with a 120-volt circuit, you can run 60 feet of 12 AWG cable without losing more than 3% voltage. With a 240-volt circuit, you can run 120 feet of 12 AWG wire while maintaining a voltage drop of 3% or less.

The American Wire Gauge system calculates wire size diameters using the complicated formula D(AWG)=.005·92((36-AWG)/39) inch. A simpler rule of thumb is that every six-gauge decrease doubles the wire diameter, and every three-gauge decrease doubles the wire’s cross-sectional area. On the other hand, wavenumbers are typically measured in reciprocal meters (1/m or m−1) or reciprocal centimeters (1/cm or cm−1).

Homeowners insurance policies will typically cover your cost to replace an electrical panel if damage occurs due to a covered circumstance such as fire, lightning, or certain types of accidents. Regular wear and tear or damage due to neglect might not be covered, so it's essential to review the policy details and consult with your insurance provider on the specifics of your coverage.

Single-pole switches are simple circuits designed for lower voltages. As such, they don’t require the complex wiring of switches that need to supply power to larger devices and appliances. This is why single-pole switches commonly go in bathrooms, closets, and other small rooms that power a low-watt light fixture. One wire creates the circuit from the power supply, the other goes to the fixture, and the final wire provides safety mechanisms through grounding.

Using a wire stripper/cutter, strip about 1/2 inch to 1 inch of sheathing from electric wires, depending on the application. A self-adjusting wire stripper/cutter works best, but a standard wire stripper/cutter with holes for different gauges of wire works as well to cut and strip away the sheath without damaging the copper wire inside.

The Rockville, VA homeowners’ guide to electrical services

From average costs to expert advice, get all the answers you need to get your job done.