Pentair Thermal Management Becomes nVent
- A New Opportunity to Spark Innovation

Your trusted brands RAYCHEM, TRACER, NUHEAT, PYROTENAX and TraceTek are now part of nVent Thermal Management.

The new company website is in development and will be launched in January 2019. Until then, we are happy to serve your information needs through our current website.

For more information on nVent:
Download press release
Visit nVent.com
(currently English only)

Quick Voltage Drop Calculator

Voltage Drop Calculator

This voltage drop calculator is for Pyrotenax Copper-Sheathed MI Wiring cable.

* Required Field


*   amperes

*   awg


*   %

*   feet


  • Ensure all the applicable requirements of the National and Local Electrical Codesare met.
  • If the voltage drop is over the desired limit, select a larger cable and repeat. Alternatively, use parallel runs of smaller cable, calculating voltage drop on the reduced current carried by each.
  • For fire pump motors, check that the voltage drop does not exceed 5% @ 115% rated current; and does not equal or exceed 15% at locked rotor current, including the drop in the motor/generator.
  • These calculated voltage drops represent line to line voltage drop in a 3-phase system. To estimate the single phase voltage drop, simply multiply the 3 phase line to line voltage drop by 1.16.
  • In the rare instances where line to neutral voltage drop in a three phase system is required, multiply the 3 phase line to line voltage drop by 0.58.
Global Headquarters

7433 Harwin Drive
Houston, TX 77036 USA
Tel: (800) 545-6258 (within U.S. only)
Tel: (650) 216-1526 (outside U.S.)
Fax: (800) 527-5703
Fax: (650) 474-7711

Other Locations

Europe, Middle east, Africa(EMEA) Headquarters
Romeinse Straat 14
3001 Leuven
Tel: (32) 16 213 511
Fax: (32) 16 213 603

Connection and Protection