33 - Clearance requirements in switchgear and control equipment Explore other articles and discussions on this topic. If the clearance anywhere on a PCB is too small, then an over-voltage event can cause an arc between neighboring conductive elements on the board. High Voltage Spacing Evan Mayerhoff High Voltage Connection, Inc. Introduction How much spacing is needed in high voltage circuits and setups? Topics include "what is switchgear?, types of switchgear, types of switchgear enclosures, front and rear access options for switchgear installation and maintenance, switchgear insulating mediums, switchgear interrupting devices, interrupt and short-circuit ratings, continuous current and ANSI and IEEE voltage classes. Termination Clearance & Bending Radius Introduction Medium Voltage Capacitor banks and Harmonic Filter Banks are typically connected to power systems by Type MV-90 shielded power cable. The general guideline in common use is to allow 7,500 to 10,000 volts, dc per inch in air. Clearance is the shortest distance through air between two conductors. Aug 1, 2016 • Technical Documents

Voltage: Description: Distance: Low & Medium Voltage: Flat roof, open balcony, verandah roof ,When the line passes above the building a vertical clearance from the highest point: 2.5 Meter: Low & Medium Voltage: Line passes adjacent to the building a horizontal clearance from the nearest point: 1.2 Meter: Low & Medium Voltage Requires 4 -10 ft. depending on voltage from 1001V to above 75 kV. When dealing with ac, the general guideline is to multiply the rms voltage by three to determine the spacing that’s required. The minimum depth of clear working space for electrical equipment for each of the 3 conditions is stated in NEC Table 110.34.

- Condition 3: Both sides of the working space have exposed live parts. Working Space around Indoor Panel/Circuit Board (NES 312.2) Clearance around an Indoor electrical panel (NEC 110.26) Clearance for Conductor Entering in Panel (NES 408.5) Articles TechTopics No. I remember its definition by thinking of overhead clearance; how much room in the air before my head whacks into something. Clearance Tables. Learn the fundamentals of medium voltage switchgear. What are the clearance requirements for SquareD/Schneider Electric Low Voltage Dry Type Distribution Transformers from walls or other obstructions? UC Irvine – High Voltage Electrical Safety Program Appendix D Cal/OSHA Clearance and Access Distances TABLE S-1 - WORKING CLEARANCES Minimum clear distance for condition(2) (ft) Nominal voltage to ground (a) (b) (c) 0-150 (1)3 (1)3 3 151-600 (1)3 3 1/2 4 (1) Minimum clear distances may be 2 feet 6 inches for installations built prior to April 16, 1981. Requires 5 - 12 ft. depending on voltage from 1001 V to above 75 kV.

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