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Other Uses for the NCB

The Nuisance Current Blocker offers many benefits, which we describe elsewhere. Beyond the essential benefits, there are multiple other uses for the NCB, which we describe in this article.

Representing the Body

Normally when you measure contact current, your body needs to be in the equation, as in this diagram.

Using the NCB, you can remove the body from the equation as diagrammed here.

Instead of holding onto the red lead on the Fluke 287 or 289 and use your body as the contact point, plug the black lead into the NCB, set the NCB dial from anywhere between 1000-2000 ohms to represent your body and put the red lead on the object. That will test between the object and the grounding reference simulating your body in between the points.

Wet conditions could be between 300-500 ohms and dry ideal conditions with no frequencies up to 10,000 ohms of resistance.

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Spectrum Analysis

Using a differential probe to measure noise on a grounding conductor is difficult, unless you have an NCB.

The red lead attaches to the grounding mat that is plugged into an outlet and the black lead typically plugs into the outlet as well.

Measuring the same point won’t give you very good results.

But putting the black lead into the NCB, finally you can then see the red lead pop up the frequencies on the grounding conductor in the wall.


But putting the black lead into the NCB, finally you can then see the red lead pop up the frequencies on the grounding conductor in the wall.


Removing Grounding Loops

A grounding loop is two or more appliances, connected together in some way (common grounding system) but fed (powered and grounded) from different outlets. It creates a loop.

A grounding loop is two or more appliances, connected together in some way but fed from different outlets.

Using the NCB on one of the appliances will help remove the loop. Caution: remember to always measure the possible rise in electric field if the appliance can’t find a ground reference. You want appliances grounded in one place, from one source, not two.

Very applicable to Oscilloscope testing equipment, being sure to not blow up your equipment. You don’t want to have the grounding systems from two sources coming together on delicate grounded test leads.


Appliances

If you have found a certain appliance is leaking current or dirty electricity “noise” to its grounding conductor, use the NCB plug.

This will reduce the “noise” contaminating your grounding system from that appliance but likely increase the electric field around the appliance and possibly increase contact current exposure should you touch the appliance.

It is best to have appliances, especially ones with metal frames and handles, solidly grounded with no resistance on the grounding conductor.

So, start by turning the dial all the way to the left, allow as much current through as the NCB will allow, while still filtering the grounding conductor. The setting provides about 14 Ohms of resistance.

Adjust the dial to the desired balance between the variables, current/noise on grounding system and electric field/contact current in immediate environment.

Work Stations

The basic principle is ground appliances, not humans. But if you have to be tethered to a grounded wrist strap at work, because of the possible static build up and discharge, the NCB may work very well to reduce the current through your body, slowly discharge the static build up and most of all, maintain an effective ground-fault path to keep you safe.

GFCI

In all applications with the NCB, it is best to have a GFCI outlet in the wall outlet to add some much needed protection. Our home circuit breakers are pretty dumb and hard to trip. GFCI outlets improves your chances of ground-fault protection significantly.

Resources

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About the Author

R Blank is the CEO of Shield Your Body, which he founded in 2012. With hundreds of thousands of customers in over 30 countries, and having been interviewed on platforms including Dr. Phil, ABC news television and ElectricSense, R is an internationally followed expert on issues of EMF, health and safety. He also hosts “The Healthier Tech Podcast”, available iTunes, Spotify and all major podcasting platforms. In the past, he served on the faculty at the University of Southern California Viterbi School of Engineering as well as the University of California, Santa Cruz. Previously, R ran a software engineering firm in Los Angeles, producing enterprise-level solutions for blue chip clients including Medtronic, Apple, NBC, Toyota, Disney, Microsoft, the NFL, Ford, IKEA and Mattel. He has spoken at conferences around the world, including in the US, Canada, New Zealand and the Netherlands, and he is the co-author, along with his father Dr. Martin Blank, of ‘Overpowered‘ from Seven Stories Press about the science of health effects of EMF radiation. He has an MBA from the UCLA Anderson School of Management and received his bachelor’s degree, with honors, from Columbia University. He has also studied at Cambridge University in the UK; the University of Salamanca in Spain; and the Institute of Foreign Languages in Nizhny Novgorod, Russia. Read more about R and SYB or connect with R on LinkedIn.

Have a Question?

I take pride in designing great, effective products, based on real, measurable science – AND taking the time to ensure that each and every one of you has the information you need to understand EMF and make informed decisions.

So if you have a question, just email me and ask.

R Blank

R Blank
CEO, SYB

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