How to Calculate Voltage Drop in Revit - Episode 10
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- Опубликовано: 30 ноя 2024
- #ElectricalEngineers #VoltageDrop #advancedelectricaldesign #electricalengineering
The Electrical Building Design Show is taking on an examination of Revit and its voltage drop calculations. Revit boasts the ability to size wires and calculate voltage drop, however, the reality is far from ideal.
The two Revit training videos that were mentioned in this video can be found here:
Voltage Drop Calculations: • ElectroBIM for Revit: ...
Wire Lengths: • ElectroBIM for Revit: ...
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Which NEC article that recommends only 3% VD for a branch circuit?
See NEC 2023 210.19 Informational Note and 215.2(1)(2), Informational Note No. 2.
Voltage drop is not a safety issue so the NEC doesn't mandate anything. The recommendation to "provide reasonable efficiency of operation" is 3% branch circuit, 5% total voltage drop.
@@DavidRobisonDM Thanks a lot for your response. Is the 5% measured from the utility transformer? Does DM measure this value?
@@minabenjamin3660 Yes, the 5% is from the utility transformer. ElectroBIM handles that calculation correctly. The training video linked in the description has complete details on all our features.
Just getting into Revit for 3D modeling, but have been working in ACAD for 20 years for Fire Alarm and Special Hazards fire protection design. It feels like fire alarm integration/detailing got left out of Revit and it's too bad. I'm not at the engineer level, but at the integration level where we need to provide submittal documents to an AHJ for approval per NFPA 72, etc. Voltage drop calculations for horn strobe or strobe devices need to be submitted for approval. I was hoping Revit or some addon could do this so we could use Revit for a full fire alarm design software, but it's not looking good. Can your software take a length of fire alarm notification devices with individual loads at 24 VDC and provide a usable v-drop calculation for AHJ approval? This may still be faster with ACAD and Excel, but I'm interested in the Revit possibilities/capabilities. There are specifics that I won't get into here that need to be met and I don't think a Revit schedule will show what we need to show.
No, we don't calculate voltage drop or do anything for fire alarm design. It is similar but not exactly the same as standard electrical design. It is not a problem we are actively trying to solve yet.