series rating label.

[electrofelon]

110.21(C) requires the following:

Tested Series Combination Systems. Equipment enclosures
for circuit breakers or fuses applied in compliance
with the series combination ratings marked on the equipment
by the manufacturer in accordance with 240.86(B)
shall be legibly marked in the field to indicate the equipment
has been applied with a series combination rating.
The marking shall meet the requirements in 110.21(B) and
shall be readily visible and state the following:
CAUTION — SERIES COMBINATION SYSTEM
RATED ____ AMPERES. IDENTIFIED REPLACEMENT
COMPONENTS REQUIRED

what is the "rated" value? Is this the value that is less than the actual available fault current, that i can use because of the series rating (i.e 10k for a 10k downstream breaker that series rates with an upstream 65K)? OR is this the actual fault current value? I always assumed this was the lesser series rating value, but I just got an inspection and the inspector is saying this should be the actual fault current available at the downstream equipment.

 

[mayanees]

I think it should be marked with the higher "series rating". So if there was a 65kA main breaker with a 10kA distribution breaker 100 feet away, the marking at the 10kA-rated breaker should say that it is series rated for 65kA and the part number for that breaker be included on the label (identified replacement component) at the remote location.
That's because the system is rated for the higher fault current at that location, as long as the correct breaker is used.

 

[electrofelon]

I think it should be marked with the higher "series rating". So if there was a 65kA main breaker with a 10kA distribution breaker 100 feet away, the marking at the 10kA-rated breaker should say that it is series rated for 65kA and the part number for that breaker be included on the label (identified replacement component) at the remote location.
That's because the system is rated for the higher fault current at that location, as long as the correct breaker is used.

I think you are right, but it seems poorly worded to me. One angle, and how I always thought of it, is that the lower value is "what you get to use" because of the series rating, so the rating is the lower value. The actual available fault current is just what it is, there is no "rating".

Seems like better wording would be something like:

Caution: series combination system
Use identified components
Available fault current is XYZ

 

[petersonra]

Is this from the 2020 code? In the 2017 version this marking is only required for engineered series rated systems.

 

[electrofelon]

Is this from the 2020 code? In the 2017 version this marking is only required for engineered series rated systems.

You sure about that? I have never had a 2017, but the section I quoted was copy and paste from 2014. did they remove it for tested combinations in 2017?

 

[don_resqcapt19]

Is this from the 2020 code? In the 2017 version this marking is only required for engineered series rated systems.

110.22(B), in the 2017 code, gives you the required marking for an engineered series rated system and 110.22(C) give the marking for a tested series rated system.

 

[Fred B]

You sure about that? I have never had a 2017, but the section I quoted was copy and paste from 2014. did they remove it for tested combinations in 2017?

It's still in 2017.

 

[petersonra]

You sure about that? I have never had a 2017, but the section I quoted was copy and paste from 2014. did they remove it for tested combinations in 2017?

I just misread it. Don has it right.

I can't say I have ever seen either of these signs.

 

[electrofelon]

I just misread it. Don has it right.

I can't say I have ever seen either of these signs.

Siemens panelboards come with the label. I don't recall ever seeing the label supplied with load centers.

 

[electrofelon]

So essentially, I need to mark non-service equipment with the available fault current when a series rating is utilized? Could think of it as an extension of 110.24(A) to non service equipment.