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11-07-2009, 01:52 AM
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Senior Toad Licker
Join Date: Jan 2006
Location: 43°39'56" -70°15'17"
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Grounding a 70w MH ballast
Wiring a 70w Ballastwise 70w MH ballast I'm confused on how to ground it, especially since I shocked myself twice.
The ballast says it must be grounded, but there's no wire for it. Would I wire the ground from the lamp to the plug, and bypass the ballast?
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11-07-2009, 02:32 AM
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#2 |
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Bla Bla Bla Ble Ble Ble
Join Date: May 2007
Location: Salem, MA
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From looking at the information provided by your link. It appears that just the ballast case needs to be grounded to the house outlet. (green wire)
Hope this helps.
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"Come on get down with the sickness" -- Disturbed  Decepticon and Reef Jedi |
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11-07-2009, 09:31 AM
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#4 |
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Bla Bla Bla Ble Ble Ble
Join Date: May 2007
Location: Salem, MA
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Si Senor
Also it is common but not totally necesary to ground the MH socket holder(nothing connected to the socket just the metal bracket that supports the socket) and reflector. Just continue that green wire up from the ballast case to the reflector/holder.
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"Come on get down with the sickness" -- Disturbed Decepticon and Reef Jedi |
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11-10-2009, 01:31 PM
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#6 | |
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Senior Member
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Location: Leominster, MA
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Quote:
This would be important if you want the GFI to trip if the light were to fall into the tank. (hopefully you are using a GFI)
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180g Disp, 50g Sump w/ MRC II Skimmer 55g refugium, 300g low light sump = 500g Water Return: Reeflow Hammerhead (3) 250w Mh (4) T5 actinics AC2 |
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11-10-2009, 02:45 PM
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#7 | |
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Bla Bla Bla Ble Ble Ble
Join Date: May 2007
Location: Salem, MA
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You are welcome, Glad it worked out for ya!
Quote:
Just curious and please dont take this the wrong way. Are you an electrician or someone with an electronics background?
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"Come on get down with the sickness" -- Disturbed Decepticon and Reef Jedi Last edited by Jennifer; 11-10-2009 at 03:02 PM. |
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11-11-2009, 09:33 AM
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#8 | |
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Senior Member
Join Date: Mar 2006
Location: Leominster, MA
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Quote:
I guess I should have been more detailed here: The GFIC monitors the current that travels through the circuit on the hot and neutral sides. If it senses more current going out than back in (a ground fault) it trips. This would protect you from shock if the light went into the tank and you put your hand in to grab it (thus creating a ground fault via your body). The current traveling through your body to ground would cause the GFIC to trip before you were badly shocked. You may feel a slight tingle but not enough to do damage. However, It would not protect from the current overload of dropping the fixture into salt water. Saltwater is highly conductive. If the light were to fall into the tank with no ground wire then the fixture would short out and draw allot more current than usual. This current would not trip the GFI as it would be going out the same circuit it was traveling back down (no ground fault), this extra current draw could cause the wiring to overheat and a possoble fire in the hood, stand ect. Your circuit breaker would trip once the current exceeded whatever the breaker size was. 15 amps is typical and allot more than most light fixture wiring is designed for. If there were a ground wire on the fixture than the current would flow down the ground causing a difference between what was going out the hot and coming back down the neutral. This would trip the GFIC. If you had an in tank tank ground probe it would also cause a ground fault and open the GFIC. Yes, I do have a strong electrical background. The light would function fine with no ground wire to the socket. I just tend to error on the side of caution when it comes to electricity, saltwater and people's safety. After all, if you are in the hospital or worse who is gona do your water changes  Hope this clears up any questions.
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180g Disp, 50g Sump w/ MRC II Skimmer 55g refugium, 300g low light sump = 500g Water Return: Reeflow Hammerhead (3) 250w Mh (4) T5 actinics AC2 |
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11-11-2009, 06:50 PM
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#9 |
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Bla Bla Bla Ble Ble Ble
Join Date: May 2007
Location: Salem, MA
Posts: 1,628
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Sweet ... Good to know you have experience in these things.
I always prefer to have my equipment grounded, and make danr shore that it is. One shock from my tank was more than I needed. My understanding of GFCI's was that they would trip if there was a short between Hot (black) and neutral (white ) as well as between The HOT and the ground (green). Thanks for not taking it personal, as it was not intended that way.
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