Class 1 Division 2 control panel 120VAC supply feed

Moistness

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Location
PA
Occupation
Senior Design Engineer
I've been researching the use of fuses in a C1D2 area and concluded that you can use current-limiting class CC fuses among other current-limiting fuses but for the sake of this question, let's stick with class CC fuse in a non-indicating fuse holder, like the Allen Bradley FB series.
I found this link that talks about the fuses: http://www.littelfuse.com/~/media/f...littelfuse-fuses-nec-class-1-division-2-c.pdf.
Also for the sake of this question, this panel is fed from a 20A circuit from a lighting panel in a safe area, and all of the proper installation guidelines for a C1D2 area are met, and I have a C1D2 rated enclosure, (NEMA4X Stainless Steel).
My question is, can I have the line side of the fuse holder with a 20A Class CC current-limiting fuse be the landing point of the "hot" conductor?
Also, this 20A fuse will distribute 120V to other lower ampacity fuses that will protect equipment like 24VDC and PLC power supplies.
Hopefully, this makes sense.
I appreciate the advice.
 

rbalex

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Staff member
Location
Mission Viejo, CA
Occupation
Professional Electrical Engineer
My question is, can I have the line side of the fuse holder with a 20A Class CC current-limiting fuse be the landing point of the "hot" conductor?
Yes
Also, this 20A fuse will distribute 120V to other lower ampacity fuses that will protect equipment like 24VDC and PLC power supplies.
The “lower ampacity” fuses will also need to comply with Section 501.115(B)(3).
 

Moistness

Member
Location
PA
Occupation
Senior Design Engineer
rbalex.
Thank you for the answer and Section Number.
That cleared things up for me.
 
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