Institute of Electrical and Electronics Engineers (IEEE)
Latest
IEEE Std C37.36B-1990
Scope
This guide is intended to provide air switch users with a means for determining the magnitude of excitation as well as
resistive and capacitive currents that may be successfully interrupted with horn-gap, vertical-break air switches in
outdoor locations mounted in the normal horizontal-upright position and not equipped with interrupting aids. The
minimum centerline-to-centerline phase spacing of each switch is based upon dimensions stated in ANSIC37.32-1972
[B1]1, Table 5, Column 6. This guide assumes that the switches are applied to an effectively grounded wye system. A
guide for ungrounded systems is being considered.
NOTE — Do not apply this guide to other types of switches. At this time, the confidence level for proper operation is not
acceptable for other types of switches.
Use of suggestions within this guide by the air switch user should be done after proper evaluation of any adverse
consequences that might result from a failure to properly interrupt the current. Adverse consequences may include
phase-to-ground or phase-to-phase dielectric breakdowns, damage to other system equipment, etc.
This guide does not modify other standards such as ANSI/IEEE C37.30-1971 (Reaff 1987) [B2] or ANSI C37.32-
1972 [B1]. Therefore, the application of this guide is entirely within the domain of the air switch user. Moreover, air
switch manufacturers are not required to warrant suggestions made by this guide.