Inspection Wire Gauges
Plastic gauges calibrated to measureNM wiring over the insulation.
Gauges designed to help professionals determine sizing of NM electrical
wires.
Gauges are designed to help aid inspectors and professionals in determining the size of most modern NM, SE, and THHN-THWN electrical wiring. The design is slim and simple, intended to be minimally invasive. You can use the gauges for visual reference, or as a GO-NO GO verification.
Gauge Sizes
Here is a list of the different gauges based on colors provided.
Red Gauges
Copper gauges are 3 pieces and cover the following:
Gauge 1 wire sizes: #14 #12 #10 #8
Gauge 2 wire sizes: #6 #4 #2 #1
Gauge 3 wire sizes: #1-0 #2-0
Green Gauges
Old Copper gauges are 2 pieces and cover the following:
Gauge 1 wire sizes: #14 #12 #10 #8
Gauge 2 wire sizes: #6 #4 #2 #1
Bone (white) Gauges
Aluminum wire gauges are 2 pieces and cover the following:
Gauge 1 wire sizes: Modern AL #6 #4 #2 #1
Gauge 2 wire sizes: Modern Compact AL SE #2-0 #4-0
Some aged wiring may have larger jackets. Service wire is the most common. Some specific brands used thicker insulation.
Gauges are Lazer cut for crisp accuracy.
Safety First!
Use of these products is not intended or designed for live or energized electrical wiring or devices. In doing so, you could cause damage, injury, or death by electrocution. Always ensure the wiring or equipment you check is de-energized or has no power. Correct PPE should also be worn when performing any work or inspections around electrical components.
Disclaimer!
The wire gauge sets are designed to be used as a general determination, and accuracy cannot be guaranteed. This set should work with most NM or residential style wiring within the last 20 years.
Due to different manufacturers and sizes, it's impossible to accommodate all different types of wiring used.
Also keep in mind older wiring had a thicker insulation, therefore the gauges supplied will not work with many older wires.
Do not force gauges onto wiring or into tight spaces. Doing so can cause breakage or damage to wiring/devices. IF the gauge doesn't fit with ease, then its either an older wire with thicker insulation or it not the correct size.
Stair Discs are Available as well!s
These work great for measuring the gaps between railings and ballusters. The best part is they are flat for easy storage and take up minimal space.
