SCCR for convenience outlet?

[JovialBulge]

When calculating the SCCR of a panel for 508a, it’s my understanding that UL is only concerned about the primary side protection of the control transformer. In my case I will have a 480VAC to 120VAC, 2kVa transformer. 10A Class CC fuse on the primarily lines, 25A Class CC fuse on the secondary side overall branch.

Off of the secondary side there will be a 120VAC to 24VDC PSU, protected by a separate 15A Class CC fuse and a convenience outlet with a built in 3A circuit breaker. It seems as if the outlet has an extremely minimal SCCR of 0.2kA. Is this something that I need to take into account with my overall panel SCCR calculations or once it’s on the secondary side of the control transformer does UL not take any of those devices SCCR into account. PSUs, convenience outlet, etc.

 

[petersonra]

Control circuits do not have SCCRs. Only power circuits.

If you can legitimately claim there are only control circuits on the xfer secondary, you should be ok.

 

[JovialBulge]

I certainly would make the claim that they are only control circuits. The only devices that would be on the secondary side of the control transformer would be the 120V/24VDC Power Supply and a 115VAC outlet for plugging in a laptop charger.

I recall an example that I saw on the MTR exam or its study material regarding a convenience outlet in a circuit, I just can’t seem to find it to reference it now.