Pool Main Pump Motor: Difference between revisions
→Motor Cable
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=== Motor Cable === | === Motor Cable === | ||
Distance from the presumed origin to the motor terminals is estimated at [TBD - to measure] ft. | |||
Shielded VFD cabling may be required to contain high-frequency emissions. | Shielded VFD cabling may be required to contain high-frequency emissions. | ||
Assume use of non-metallic conduit (ENT); Table 1, Chapter 9 applies. Cross-sectional fill of 53% is permitted. So, for a 1-1/4" ID conduit, cable may have up to a 0.66" diameter. For a 1-1/2" ID conduit, cable may have up to a 0.80" diameter. VFD cable counts as a single conductor for conduit fill. | |||
* The Yaskawa GA50U2042ABA accepts up to (and recommends) #6 AWG on U/T1, V/T2 and W/T3 terminals. | |||
Options under investigation: | |||
* Automation Direct has #8 AWG 4-conductor XLPE insulated shielded cable, rated for 50 A at 75 °C (NEC 310.15 (B), assumes 30 °C ambient) for $8.08/ft (August 2021 pricing). The cable is made in USA by Southwire. This cable has an OD of 0.87 inches and minimum bend radius of 10 inches. Calculations suggest a 1-1/4" conduit may be necessary to pull a cable of this diameter with adequate fill margin. The existing PVC conduit appears to be about 3/4" (to confirm), which would need to be replaced. | * Automation Direct has #8 AWG 4-conductor XLPE insulated shielded cable, rated for 50 A at 75 °C (NEC 310.15 (B), assumes 30 °C ambient) for $8.08/ft (August 2021 pricing). The cable is made in USA by Southwire. This cable has an OD of 0.87 inches and minimum bend radius of 10 inches. Calculations suggest a 1-1/4" conduit may be necessary to pull a cable of this diameter with adequate fill margin. The existing PVC conduit appears to be about 3/4" (to confirm), which would need to be replaced. | ||
* In January 2022, there appears to be a low-cost option to purchase Lapp Kabel #760604 (4 x #6 AWG) VFD cable for less than $6/ft. This cable has an OD of 25.5 mm (1.00 inches). | * In January 2022, there appears to be a low-cost option (on eBay, Michigan-based seller) to purchase Lapp Kabel #760604 (4 x #6 AWG) VFD cable for less than $6/ft. This cable has an OD of 25.5 mm (1.00 inches). | ||
=== Bypass === | === Bypass === | ||