Did You Ground Your Heatsink? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-07-2011, 10:13 PM Thread Starter
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Did You Ground Your Heatsink?

For all you LED DIYers did you ground your heatsink to earth ground? Will grounding it interfere with the circuit in any way?

Thanks,
Roger
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post #2 of 7 (permalink) Old 02-07-2011, 10:25 PM
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the heatsink has nothing to do with the circuit so it won't interfere or help.


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post #3 of 7 (permalink) Old 02-08-2011, 04:42 AM
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I grounded the heatsink, and the negative lead from the power supply for the LEDs. That guarantees that the maximum voltage on the LED circuit is, in my case, about 50 volts, and it makes the heatsink safe to touch, always at zero volts above ground. It doesn't interfere with the LEDs at all.

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post #4 of 7 (permalink) Old 02-08-2011, 11:04 AM
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always ground all exposed metal parts on any DIY electrical/electronic equipment... probably means you wont die if you screw something up... as far as the circuit goes if you have built it well it wont interfere with anything... if you have screwed it up and earthed the fixture with a GFCI installed at worst it will pop the circuit breaker, and everyone lives and your house doesnt burn down.

If you dont know what you are doing dont do it.


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post #5 of 7 (permalink) Old 02-08-2011, 02:39 PM Thread Starter
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Quote:
Originally Posted by Hoppy View Post
I grounded the heatsink, and the negative lead from the power supply for the LEDs. That guarantees that the maximum voltage on the LED circuit is, in my case, about 50 volts, and it makes the heatsink safe to touch, always at zero volts above ground. It doesn't interfere with the LEDs at all.

Hoppy,

It makes sense to me to ground the heatsink to the AC ground in the house but I wonder if it would be better to let the DC voltage float. My thinking is this, if neither the pos nor neg it tied to ground then to get shocked from the DC circuit you would have to touch both sides at the same time. With the voltage floating, in theory, you could touch one point anywhere in the DC circuit and not get shocked.

What do you think?

Thanks,
Roger
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post #6 of 7 (permalink) Old 02-08-2011, 04:53 PM
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Originally Posted by rvcrawford View Post
Hoppy,

It makes sense to me to ground the heatsink to the AC ground in the house but I wonder if it would be better to let the DC voltage float. My thinking is this, if neither the pos nor neg it tied to ground then to get shocked from the DC circuit you would have to touch both sides at the same time. With the voltage floating, in theory, you could touch one point anywhere in the DC circuit and not get shocked.

What do you think?

Thanks,
Roger
I spent some time agonizing over this when I made my first LED light, then persuaded myself that I prefer to know that the voltage on my LEDs can never go above the max DC voltage the driver circuit delivers. I suspect it makes no difference, and the circuit diagrams included in the PDF for Cree LEDs doesn't show a ground, so I know it will work without it.

Hoppy
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post #7 of 7 (permalink) Old 02-08-2011, 05:06 PM
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nope, no ground needed or required on my build.
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