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Square D / Wigginton ("Wiggy") Model 5008 Voltage Tester
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Square D / Wigginton "Wiggy" Model 5008 Voltage Tester - RF Cafe Cool Product

Square D / Wigginton Model 5008 Voltage Tester

Square D Model 5008 Box Top - RF Cafe

Square D Model 5008 Box Top

Sometime in the mid 1970's while working as an electrician, I bought this Square D / Wigginton (aka the "Wiggy") Model 5008 Voltage Tester. It was probably considered high tech in the day. It uses a simple solenoid to drive the indicator needle. The scale begins at 120 volts and ends at 600 volts on the alternating current (A.C.) side, and 120 through 400 volts on the direct current (D.C.) side. Surprisingly little information on the 5008 is available on the Web.

Close-up of the business area of the Square D model 5008 Voltage Tester. The image is poor due to the plastic cover being crazed.

Information sheet for the Square D 5008 - RF Cafe

Information sheet for the 5008.

Square D 5008 direct current (D.C.) polarity indicator - RF Cafe

Direct current (D.C.) polarity indicator.

measuring house voltage with the Square D model 5008 tester - RF Cafe

Example of measuring house voltage with the Square D model 5008 Voltage Tester.

The highest voltage I ever measured with it was 480 VAC (3-phase), supplying a concrete block forming machine in Annapolis, Maryland. It was kind of a spooky experience. I'm comfortable around 240 VAC, but above that level I worry about compromised insulation, especially in damp environments.

Even with the availability of much more sophisticated analog and digital multimeters, this is still my instrument of choice when working on house circuits. It is still in very nice condition and gets used on a regular basis - as recently as a couple days ago when adding a couple circuits to my daughter's horse barn.

One nice thing about the solenoid is that you can hear and feel the presence of an A.C. voltage due to the vibration. Telling the difference  between 115 volts and 230 volts is easy without ever looking at the indicator.

The 5008 can be used to test direct current (D.C.) voltages as well, but I have never used it for that. There is a ferrite disc in the top plastic window that indicates which prod is connected to the more positive voltage. Red up means the red-leaded prod is more positive; black up (the unenergized default) means the black-leaded prod is more positive. I do not have a D.C. supply with high enough voltage output to demonstrate the function. I suppose I could fire up the vacuum tube powered Crosley 03CB Console Radio and measure the 300 VDC on the plates, but that is too much trouble, and I might break something in the process ;-)

Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles - RF Cafe

Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

US2586203A patent
Inventor:Francis Boyle
Assignee: Wigginton Co.

When I first starting using the 5008 during classes at the Lincoln Technical Vocational Center in Annapolis, Maryland, (c1975) ground fault interrupter (GFI) receptacle and circuit breakers were relatively new, and I don't recall using them there. If you didn't have one of the plug-in receptacle polarity testers, the way to check to be sure the neutral wire was on the left and the hot wire was on the right (ground hole down) was to put one prod of the Square D 5008 Voltage Tester into the right slot (which should be the hot side of the receptacle) and the other prod into left slot. 120 V should be indicated. Then move the prod from the left slot to the ground hole and 120 V should also be indicated. If not, then the neutral and hot wires were reversed on the receptacle. That method works well for non-GFI circuits, but on GFI-protected circuits the current flowing through the solenoid coil is enough to cause the protection circuit to trip the breaker (or receptacle). A digital multimeter (DMM) using a field effect transistor (FET) input has high enough resistance (impedance) that it does not draw sufficient current to trip the GFI. Modern plug-in type receptacle polarity testers will not trip a GFI, but my older model does.



Posted December 16, 2022

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