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IEEE 1584-2018 Electrical Bus Gaps Typical by Enclosure Size

Electrical and Electronics Design and Engineering

IEEE 1584-2018 Electrical Bus Gaps Typical by Enclosure Size

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This table relates voltage class, gaps, and enclosure sizes per IEEE 1584-2018. The enclosure sizes can be used to derive the enclosure size, incident energy correction factor.

Classes of equipment and typical bus gaps

Equipment class
Typical bus
gaps (mm)
Enclosure Size (H × W × D)
SI units (metric)
Imperial units
15 kV switchgear
152
1143 mm × 762 mm × 762 mm
45 in × 30 in × 30 in
15 kV MCC
152
914.4 mm × 914.4 mm × 914.4 mm
36 in × 36 in × 36 in
5 kV switchgear
104
914.4 mm × 914.4 mm × 914.4 mm
36 in × 36 in × 36 in
5 kV switchgear
104
1143 mm × 762 mm × 762 mm
45 in × 30 in × 30 in
5 kV MCC
104
660.4 mm × 660.4 mm × 660.4 mm
26 in × 26 in × 26 in
Low-voltage switchgear
32
508 mm × 508 mm × 508 mm
20 in × 20 in × 20 in
Shallow low-voltage
MCCs and panelboards
25
355.6 mm × 304.8 mm × ≤203.2 mm
14 in × 12 in × ≤8 in
Deep low-voltage
MCCs and panelboards
25
355.6 mm × 304.8 mm × >203.2 mm
14 in × 12 in × >8 in
Cable junction box
13
355.6 mm × 304.8 mm × ≤203.2 mm
or
355.6 mm × 304.8 mm × >203.2 mm
14 in × 12 in × ≤8 in
or
14 in × 12 in × >8 in

Reference:

IEEE 1584-2018

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