You are here: Home > Support > Knowledge Base > How Building Angle Affects Calculations

How Building Angle Affects Calculations

Wednesday, December 18th, 2019

Q: When I have my feeder calculation method or branch circuit calculation method set to Right Angles, I have the option to set a Building Angle as well. How is this value used, and how does it affect wire length and other calculations?

A: The Right Angles calculation method is used to simulate running the wire through the walls of the building, rather than in a straight line. To get accurate calculations, you need to tell the software how the walls are oriented. Setting the Building Angle does this by offsetting the orientation of walls relative to the alignment point in Electrical for AutoCAD, or relative to Project North in Electrical for Revit.

When the Building Angle is set to zero, the walls are assumed to be parallel and perpendicular to the alignment point or Project North — in other words, running north-south and east-west. The wire lengths are calculated accordingly, as shown below.

Increasing the Building Angle value will offset the walls in a counterclockwise direction. Setting it to 45 degrees will result in wires that run southwest-northeast and northwest-southeast, as shown below.

Having an incorrect Building Angle can significantly impact wire length calculations, which will affect fault and voltage drop calculations in turn. The examples above use the same start and end points, but return 31′ for the first calculation and 26′ for the second — a 17.5% difference.

Related Articles

Filter by
Post Page
Electrical Electrical Training Calculations Light Fixtures Electrical RT Electrical Rooms
Sort by

Dwelling Unit Load Calculations

This training video teaches you how to calculate feeder and service loads for dwelling units in Design Master Electrical.


Feeder and Service Load Calculations

Use this, along with NEC 220 Sections III and IV, to determine how to correctly model your loads.


Feeder and Service Calculations

This article explains the calculation methods available in the Feeder and Service Calculation Settings dialog box and how loads should be configured for each method.


Base Units and Photometrics Calculations

If your photometrics calculations appear too condensed or spread out, you may have your base units set incorrectly.


Electrode Configurations for Arc-Flash Calculations

This article will help you determine the electrode configuration for your distribution equipment, in order to perform arc-flash calculations.


Room Data and Photometrics Show Different Foot-candle Values

Different values for room and point-by-point foot-candle calculations are a result of different calculation methods.



Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

System Requirements


Contact Support

Install & Update Instructions

Online Training

Knowledge Base

User Manuals


Release Notes


Wish List

Remote Support



Customer Stories





Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

Free Trial

Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

©2001-2020, Design Master Software, Inc