# Ac over tether and powersupply

**URL:** https://discuss.bluerobotics.com/t/ac-over-tether-and-powersupply/19139
**Category:** General Discussion
**Created:** [January 23, 2025, 8:45pm UTC](https://discuss.bluerobotics.com/t/ac-over-tether-and-powersupply/19139 "2025-01-23T20:45:39Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Jhans](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jhans/32/18197_2.png) [@Jhans](https://discuss.bluerobotics.com/u/Jhans)
#### Post date: [January 23, 2025, 8:45pm UTC](https://discuss.bluerobotics.com/t/ac-over-tether-and-powersupply/19139/1 "2025-01-23T20:45:40Z")

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Have anyone tried to install a powersupply like this in a BR enclousure?

Any thoughts regarding cooling inside the enclousure?

 ![IMG_4705](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/6/68e1b2a9856f36c11e136f3ed61761f62a1b96ed.jpeg)

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### Author: ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)
#### Post date: [January 24, 2025, 6:21pm UTC](https://discuss.bluerobotics.com/t/ac-over-tether-and-powersupply/19139/2 "2025-01-24T18:21:51Z")

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Hi @Jhans -  
That seems like a very risky idea! AC voltage in water can be very dangerous compared to DC, and a common GFI may not react fast enough to prevent dangerous situations, especially if high current is being drawn.

Commercial systems available for the BlueROV2 all use DC voltage (400V + ) over the tether for safety and efficiency.