Originally Posted By: pmagrone
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http://www.nachi.org/bbsystem/usrimages/D/Double_tapped_wiring…JPG ]
http://www.nachi.org/bbsystem/usrimages/D/Double_tapped_wiring…JPG ]
Originally Posted By: jpope
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Double taps are never a “good” thing, but this appears to be a common practice with these suppressors (they are very rare in CA except for a development in San Diego County
).I would still write it up as a double tap and let an electrician explain it.
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Jeff Pope
JPI Home Inspection Service
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Originally Posted By: pmagrone
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Thank you for your help. I wrote it up as a double tap and suggested further evaluation by a licensed electrician.
Originally Posted By: bbadger
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Any surge suppressors I have installed have instructions with them requiring overcurrent protection.
In other words a 2 pole breaker should be added to this panel for the connection of the surge suppressor.
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Bob Badger
Electrical Construction & Maintenance
Moderator at ECN
Originally Posted By: Greg Fretwell
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Bob, nothing says it has to be dedicated O/C protection. They are usually tapped into a breaker for a 240v appliance around here.
Originally Posted By: bbadger
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| Greg Fretwell wrote: |
| Bob, nothing says it has to be dedicated O/C protection. They are usually tapped into a breaker for a 240v appliance around here. |
No nothing says they have to have dedicated OCP but they must like any other electrical equipment must have OCP that matches the rating.
The instructions will specify an OCP size.
A unit like this will often require 20 amp OCP, if the appliance breaker happens to be the right size and the unit is connected in a way that does not violate 110.14 then I agree. 
Besides are you saying just because it is commonly done that makes it right?
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Bob Badger
Electrical Construction & Maintenance
Moderator at ECN
Originally Posted By: Greg Fretwell
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If it is permitted in the installation instructions it is right.
Originally Posted By: pabernathy
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Man…a good harty debate amount us electricians and where am I…without a code book sitting in a home inspection CE class in northern va…lol…gotta get those earned credits…lol
Anyway.....the old style SS units were actually tapped into the main feed as shown in this picture.....but the latest versions are actually as Bob described in that they would require their own OCPD but again their are still some direct connect versions out their...wish I had names right now..
However.....Their is a article on this in the NEC refering to now you are not allowed to directly connect these to the main terminals....I believe...so do not quote me as I am without my book and to be honest with you these are not very common in my area.....
But you all can bet once I am back.....the code book will FLY open and I will post a more detailed comment....lol...I am never for a lost for words fellas....
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Paul W. Abernathy- NACHI Certified
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Originally Posted By: Greg Fretwell
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When I installed the supressor in my panel I seem to remember it could be on anything up to 30a. There is nothing on it to say and I long since lost the paperwork.
I had a 2 pole 20 handy so that is what I used but it is also serving a multiwire circuit for the far bedrooms. I pigtailled a short #12 solid on the supressor so it would give a better bite on the QO breaker.
There should not really be any static load on a supressor other than the LED. It only conducts on a surge. The length of the transient will usually be so short the breaker will never see it.