Man i hate these Harbor Freight/ Hydrofarm digital timers

NirvanaMesa

NirvanaMesa

Well-Known Member
Airwalker16 said:
Not much can go wrong with them besides an arc, and if that does happen, you'll know about it.
Click to expand...
If you are starting a big load, the load should be run through a contactor switch used for well pumps. This will take the contact arcing off of the timer itself. They are basically heavy duty relays.
 
S

shimz

Well-Known Member
Renfro said:
How? If one phase is off then there is no path for the circuit to be complete.
Click to expand...
Cobby is right, it is considered single phase, but the legs are 180° out of phase. There is still the neutral line, so the circuit persisted, released some of the magic smoke in the lumitek ballast and scared the shit out of me. Luckily there was enough smoke left to keep it running for another 3 years, lol.
 
Renfro

Renfro

Well-Known Member
CobKits said:
there is single phase and 3 phase power, the latter being pretty uncommon in non-commercial installations

240VAC is always single phase in US, even in a 480/240 system
Click to expand...
I know that, I worked as an electrician for many years. Now a 240v feed is two hots (phases), if one if off the other can't flow either, unless there is a ground fault.
 
Renfro

Renfro

Well-Known Member
shimz said:
Cobby is right, it is considered single phase, but the legs are 180° out of phase. There is still the neutral line, so the circuit persisted, released some of the magic smoke in the lumitek ballast and scared the shit out of me. Luckily there was enough smoke left to keep it running for another 3 years, lol.
Click to expand...
There is no neutral in a 240v lighting feed, no ballast out there uses that.
 
S

shimz

Well-Known Member
At least in my house, if I cut 1 leg of a 240v feed, I still have 120v on the other relative to ground. Ground/neutral are tied together at the box, so it was like I was powering the ballast with 120v, which was a no-no for the 240v only ballast.
 
Renfro

Renfro

Well-Known Member
shimz said:
At least in my house, if I cut 1 leg of a 240v feed, I still have 120v on the other relative to ground. Ground/neutral are tied together at the box, so it was like I was powering the ballast with 120v, which was a no-no for the 240v only ballast.
Click to expand...
Your ground isn't supposed to be used unless there is a fault (short to ground).
 
dstroy

dstroy

Well-Known Member
240v.png

Of course you can still measure 120vac on a leg relative to "neutral". That's normal, and expected. The 240v circuit is still open.

shimz said:
At least in my house, if I cut 1 leg of a 240v feed, I still have 120v on the other relative to ground. Ground/neutral are tied together at the box, so it was like I was powering the ballast with 120v, which was a no-no for the 240v only ballast.
Click to expand...
 
B

Bookush34

Well-Known Member
I had one of these peices of junk on my auto water system. Fucker stuck on and flooded my room with 20gals of water.

Now that timer runs my mixer for the rez.

Still want to get a 3x3 20gal food tray to catch it if I have a fuck up again.
 
You must log in or register to reply here.
Top