Arc Resistant Gear
ANSI/IEEE C37.20.7 defines switchgear arc resistance in two basic categories:
- ANSI type 1
Arc resistance from the front of gear only
- ANSI type 2
Arc resistance provided from the front, sides and rear
A suffix may be added to either of these two types to further define the type of protection provided:
- A: Basic design
- B: Arc resistance is maintained even while opening designated low voltage compartments
- C: Arc resistance is maintained even when opening designated adjacent compartments
- D: Special designation that supplements the Type 1 designation, but identifies additional arc resistance in certain structures
Eaton offers arc resistant medium voltage (MV),and low voltage (LV) switchgear and arc resistance MV motor control. Eaton also offers a unique “arc preventative” LV motor control center (FlashGard) that protects the operator by reducing the likelihood that an arc would occur.
Eaton's VCP-W arc-resistant vacuum switchgear (5 kV through 38 kV class) protects operating and maintenance personnel from dangerous arcing faults by redirecting or channeling the arc energy out the top of the switchgear.
Standard safety features include through the door switching, visible blade viewing windows, door interlocks and full type 2B arc resistant rating even with control doors open.
The unique isolation switch design disconnects the starter from the medium voltage source in the rear arc chamber, not in the front starter compartment—improving protection for workers in the event of an arc flash.
This enclosure was designed to be robust enough to contain the high pressure and heat present during an arc flash event. If arcing occurs, the doors of the switchgear remain closed and the vents seal off-protecting the operator from contact with the arc.
This MCC lowers the probability of the creation of a short circuit phase-to-phase or phase-to-ground fault, lowering the possibility of an arc flash event.