Interrupting the EGC with a device

[ron]

There is not much information at the website below, but it appears that they are placing a device (probably a reactor) in series with the EGC to prevent ground transients from affecting the equipment.
Ground Transient Terminator (GTT)
http://www.9corp.com/
Anyone have trouble with the discontinuity of a EGC?

 

[hbiss]

Re: Interrupting the EGC with a device

No discontinuity. This is a simple reactor (choke coil). The low DC resistance and 50/60 Hz impedance apparently is its "claim to fame". They don't give any figures but I would assume it would be sufficiently low to carry a fault current equal to whatever the equipment it is used with is protected for. It does have a UL listing.

 

[ron]

Re: Interrupting the EGC with a device

If it changes its impedance that fast to reduce transients on the EGC, why will it not reduce a fault. I suspect that some types of ground faults (arc faults in particular) have a transient characteristic rather than "full on".

 

[hurk27]

Re: Interrupting the EGC with a device

OK they blew it in the second page I read:
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"The Unresolved Problem
Excess energy on the ground line, sometimes called ground transients, can originate from many different sources such as Ground Injection Noise, Ground Faults , Ground Currents, Lightning, Utility Switching and Electrostatic Discharge. All of the these occurrences result in energy flowing towards the earth ground , whether it be via the ground line of equipment or the common ground system of the building itself. Ground Faults It can and will flow back up the ground line and disrupt the operation of electronic equipment. In addition, since all facilities share a common ground system, if an electrical disturbance is introduced into this system it can be distributed anywhere throughout the facility before, if ever, reaching the earth ground and even then it may not be completely absorbed.