5 – 6
5.1.3.1 Clearances / arcing space
Generally:
The installation space dimensions given on the type label ensure the necessary clearances to grounded metal surfaces up to
600 V AC according to UL 489.
Additional guidelines for applications without compartmentalization as cubicles or for positioning of parts within the cubicle are given below.
Clearances to live parts, grounded metallic parts and non-conductive parts must be maintained. The required minimum clearances are
specified for rated voltages of 480 V AC and 600 V AC. In consideration for a ventilated switchboard: the minimum installation volume is
calculated based on the specified height, width and depth, taking into consideration the power losses of ventilated switchgear.
5.1.3.2 Fixed-mounted circuit breaker
1) Cubicle door
A Minimum clearance see (page 5-8)
C Minimum distance to the bus
X Installation clearance of the barrier
y1 Distance of the barriers
y2 Height of the barriers
y3 Height for pressure dissipation
Z1 Width of the barriers
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