Desktop Configuration Guide
Pin Spacing Rules

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Overhead Design Analysis (OHDA) uses NESC pin spacing rules by default. The XML file that defines the NESC pin spacing rules is provided in the Bin\Xml folder of your ArcFM Solution installation, titled NESCPinClearances.xml.

To modify these rules, you will need to:

  1. Edit the XML to reflect desired rule changes, either manually or using the Clearance Rules tool..
  2. Save the file into the Bin directory with the name MinerStructuralAnalysis_PinClearances.xml.
When conductors of unequal voltages are strung between two horizontally aligned pins, OHDA uses the higher voltage conductor to analyze the clearance rules for pin spacing.

XML Structure for Pin Spacing

Tag Attributes Description
<ClearanceRules> clearanceruletype Root element
<RuleName> The name of the rule
<RuleDescription> Description of the rule
<HorizontalClearances>

 

 Container element for HorizontalClearance tags
<HorizontalClearance>

clearance

voltage

The HorizontalClearance tag defines each rule with the clearance attribute in inches giving the minimum distance between pins and the voltage attribute in kilovolts providing the minimum voltage of the conductor

Because the voltage attribute represents a minimum, a conductor with 14kV will inherit the clearance distance of the 13.8kV voltage in the example below. 

 

The attributes in all OHDA configuration files are defined using imperial units. The metric setting in the user interface does not change this behavior.

 

NESC Pin Spacing Rules
Copy Code 
<?xml version="1.0" encoding="UTF-8"?>

<ClearanceRules clearanceruletype="PinSpacing">
  <RuleName>NESC Pin Spacing Rules</RuleName>
  <RuleDescription>Default NESC pin spacing values</RuleDescription> 
    <HorizontalClearances>
       <HorizontalClearance clearance="12" voltage="0"/>
       <HorizontalClearance clearance="12" voltage="2.4"/>
       <HorizontalClearance clearance="12" voltage="4.16"/>
       <HorizontalClearance clearance="12" voltage="8.7"/>
       <HorizontalClearance clearance="14" voltage="12.47"/>
       <HorizontalClearance clearance="14" voltage="13.2"/>
       <HorizontalClearance clearance="15" voltage="13.8"/>
       <HorizontalClearance clearance="15" voltage="14.4"/>
       <HorizontalClearance clearance="19" voltage="24.94"/>
       <HorizontalClearance clearance="23" voltage="34.5"/>
       <HorizontalClearance clearance="27" voltage="46"/>
    </HorizontalClearances>
</ClearanceRules>

 

 

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