NEC Compliant..?

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themurph

Member
Would it be allowed to put a filter at the output of a line circuit breaker to stop noise or frequencies inside a house breaker panel..?
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
PE (Retired) - Power Systems
Re: NEC Compliant..?

Is your filter rated for the fault current at the panel (which is probably the service entrance)?

Is the breaker you want to use dedicated to the filter or shared with another circuit (many breakers are rated for only one conductor)?

Is the filter being applied per it's Listing?
 

themurph

Member
Re: NEC Compliant..?

Filter is rated to the rating of the breaker, (20Amp filter to a 20 Amp breaker)


One filter is dedicated to one breaker and one breaker is dedicated to one line or circuit...!


Filter is being applied per it's Listing...!
 

al hildenbrand

Senior Member
Location
Minnesota
Occupation
Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: NEC Compliant..?

From "house breaker panel" I get the image of a 100 Amp 120/240 Volt single phase load center. If this filter is inside the load center, there will be cross sectional area fill limitations to comply with.
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
PE (Retired) - Power Systems
Re: NEC Compliant..?

The full load amp rating of the filter is not suffcient to determine it's suitability. You must also know what fault current rating it has as well as the available fault current where the it is being mounted.

Because your filter has a 20A rating, it sounds like it is wired in series rather than in parallel with the load. As Al noted, physically installing this in the panel may not be possible.
 

themurph

Member
Re: NEC Compliant..?

This Filter gets hard wired to the output of the breaker (it is the exact width of the breaker) then the line or circuit gets wired to the Filter. The filter is designed to eliminating the noise from that designated line from entering the load center and then exiting the residence..! One Filter to each line in the load center...!
 

al hildenbrand

Senior Member
Location
Minnesota
Occupation
Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: NEC Compliant..?

I'm not sure I understood that. Your filter is eliminating noise that would go toward the power company?
 

themurph

Member
Re: NEC Compliant..?

That is correct Al, we have developed (engineered) a Filter about the size of the end of the average mans thumb a little less than 1" wide that will keep noise from exiting a residence. We don't expect the noise (frequency) to effect the Power Company but the neighbors service, could possably be effected. The Filter is in series with the residence...!

The origional question is "Can we put this specifically designed filter inside the load center".....?? And it be compliant to NEC...?
 
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