Electrical Panel Sizes and Circuit Wiring
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We have installed a 100 amp breaker box in a new work shop, what size breakers do I attach the main lines to in the 200amp box…
© By: Dave Rongey
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Electrical Panel Wiring and Circuit Breaker Size
Background: Roland, a Handyman from San Antonio
[ad#block]Question: At our ranch we have a 200amp panel box and we have installed a 100 amp breaker box in a new work shop, what size breakers do I attach the main lines to in the 200amp box?
Dave’s Reply:
Thanks for your electrical question Roland.
The rating of the 100 amp panel is just that, it is a maximum amperage rating. So my question to you is what size wire did you install to this 100 amp panel? Did you install wire sized to support a circuit rated at 100 amps? If so then the circuit breaker size must be 100 amps. Keep this in mind: the circuit breaker size is determined by the smallest wire size in that circuit. Ideally the wire sizes should in fact be all the same size unless there is a junction where copper and aluminum wire types are spliced. The other determining factor is the insulation type which is rated for many things including temperature. So I cannot give you an answer unless I know about all the missing information about the wires that were installed.
The Following links will assist you with your electrical question:
Electrical Wire and Amperage Table
Electrical Junction Boxes
Electrical Code for How Many Wires in Junction Boxes
Circuit Breakers
House Wiring Circuits and Circuit Breakers
Electrical Panel Circuit Listing
Electrical Wiring
Electrical Wiring
Home electrical wiring projects with pictures and wiring diagrams.
This link is helpful as a Handyman
Do-It-Yourself Electrical
Make sure not to miss these Resources for: How-To-Videos
Electrical Videos
The following may also be helpful for you:
A Complete Guide to Home Electrical Wiring
Be sure to get your copy of my BIG Book:
Perfect for Homeowners, Students and Electricians
Includes:
Home Electrical Wiring - Room by Room
120 Volt Circuits
240 Volt Circuits
Multi-Wired Circuits
Wiring Methods for Installing Home Electrical Circuit Wiring
Electrical Codes for Home Electrical Wiring
....and much more.
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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
Electrical Tips to Help You Wire it Right
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The Safest Way to Test Electrical Devices and Identify Electric Wires!
The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
The Quickest Way to Check for Faulty Electrical Wiring!
The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets
Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency
Lights indicate if wiring is correct and indicator light chart is included
Tests standard 3-wire outlets
UL Listed
Light indicates if wiring is incorrect
Very handy and easy to use.
Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!
The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..
The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.
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Electrical Parts to Help You Wire it Right
Circuit Breakers, Panels, Parts and Accessories
Circuit Breaker Siemens ITE
Circuit Breaker ITE GFCI
Circuit Breaker ITE AFCI
Circuit Breaker Square D
Hot Tub Panel
Sub Panel 120 240volt 100amp
Sub Panel 120 240volt 125amp
Panel 120 240volt 200amp
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