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What experience requirements did you need to sit for your designers? I’ve considered sitting for it on and off for several years.

Almost.. would be the DSPS (Department of Safety and Professional Services)

You need an HVAC contractors license. There is no state required personal licensing in Wiscosin for HVAC or refrigeration anymore. The refrigeration license went away a few years ago under Scott...

I did some volunteer work in Tennessee a couple of months ago. Ended up spending most of my time replacing plumbing in a house that the rats had literally eaten. The entire top of the dishwasher was...

Pretty much exactly my experience and feelings. Pro1 Makes a very straightforward thermostat, and Ecobees are great for a smart thermostat.

Okay... I’m just going to speak for myself and say I don’t understand the question. Maybe some other guys are familiar with your style of lingo, but I’m not getting it.

Could you re-write that...

I think there is some perspective missing here.

IMO, and hey, I’m not contributing. I don’t know enough on either side of this picture to really help, I’m just reading and trying to learn a...

Thinking about this.. probably the reason wireless thermostats are so expensive is because the wireless link has to be reliable enough for closed loop control.

If you loose Wi-Fi connectivity to...

I’m visiting in-laws/vacationing in Phoenix at the moment. Does that count?

I don’t have work connections here, and these guys all seem to work weird hours. Sometimes I see trucks on the road...

Isn’t that what the Nest was built for? I’m really surprised no has brought this up, knowing how well loved they are here.

Seriously, the smart thermostats can do everything, have wireless sensors...

Properly terminated means that the shield is solidly connected to ground on one end (preferably the end where the signal is generated)and insulated at the other end. Ever see shielded cable have a...

One of my sayings is that harness are for catching you when you trip over the lanyard.... I’m not against safety, but I also don’t believe it’s possible to make enough rules to be safe. A little...

It cost a lot less and there is a lot less risk involved in starting a residential business. That’s the long and short of it.

For me personally, I can get really tired of dealing with home owners...

So... long story. Short version.

I grew up in a family business doing all three trades ( plumbing, electrical, HVAC/R). We also ran another company ( original family business my grandfather...

I’m an electrician who started off mostly focused on HVAC/R. The only reason I’m doing electrical now is because I wanted to finish getting my masters license and I was approached with job offers....

Yup, I do remember correctly. This is from Amtrol’s Extrol expansion tank installation instructions.820013

I thought that bladder tanks were supposed to be mounted vertical so they didn’t trap air and rust the tank out? Am I not remembering correctly?

Okay, makes sense.

To clarify, when I wrote that the boiler was the “other side” of the heat exchanger, I was thinking of the indirect water heater. I like to think of things in their basic...

I really should sketch this out to make sure I understand your system, but, let me take a shot at describing what I think you have.

The way I’ve been reading this, you have a solar thermal storage...

The way I see it, there are two ways to attack the problem. Either you need a heat source that can modulate that low, or you need to store the energy so it can be used over time.

I’ve used super...

I’ve never liked this set up you have Mikey. It’s an inherently flawed design in my opinion.

A tankless water heater is specifically designed to run low flow with a high temp rise. In your...

The biggest reason people drive ground rods at generators is because it was required in the installation manual of most generators until recently. There was a big stir about that a few years back...

Nice post!

BX never really existed in a sense. It was a trade term for a cable product that was never listed by a NRTL. It had multiple problems, including being a poor ground. But hey, I still...

No, it means just what it says. A lot of conduit fittings are not necessarily listed at all, they are just made to standards. A fitting used for equipment grounding in a flexible metal raceway has to...

That’s for FMC or LTFMC (flexible metal conduits)

Rigid metal piping systems are considered an equipment grounding conductor, it can be used at any length or amperage without limitation. It’s no...

Look it up sometime. NEC 250.118


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Umm, no. You might have a local code that requires that, but not the NEC. It’s become common place to pull a wire type grounding electrode, primarily because the IEEE made that recommendation, but...

It's pretty difficult to avoid being grounded. When we're doing live work we wear shoes with electrical rated soles and put down insulation blankets or pads.

In your case, you want to avoid...

Like NewOldtech said.

I didn't miss the point, if I'm going to take the time to make sure I'm grounded, then I'm going to get a meter. If I'm walking up to something I just habitually hit it with...

The reason is that if current flows when you touch something then the muscle will contract away from what you're touching. If you grab something with the front side of your hand, the muscle...

I agree. While it's true that the best thing to do would be to check with a meter, I like to be in the habit of brushing stuff with the back of my finger when I'm walking up to an unkown.

The...

[emoji106][emoji106][emoji106] Your education is 99% complete. I won't send any emails.[emoji2]

Exactly.

Bad daddy, I think you actually know this now, your just hoping there is a quick easy way to drive a ground rod still.... there's not. If the premise wiring has a problem, then somebody...

You're right, their called ungrounded systems. Used to be commonly used in steel mills or other critical installations, because a single ground fault would not cause a problem or create a hazard.
...

Not sure I'm getting you yet, but here goes.

Grounding is accomplished with grounding electrodes. The code lists at least a half dozen types, it includes:

Ufer ground. 20' of 1/2 rebar...

Actually, there probably is a connection to a water pipe, something, even from the 30's.

The neutral should be grounded at the service, and the case of the equipment should be connected to the...

The utility always takes the neutral point of a transformer to ground. Then the neutral is taken to ground one more time at the service. For the purposes of this discussion I've been sticking with...

To the transformer, not to earth. Why would the current flow to earth, what voltage would drive it?

Here ya go, another pretty picture. https://images.platforum.cloud/uploads/20200806/97f29a1e2781b28aa3116bcc0c6adf81.jpg

A metal water pipe over ten feet long, buried in the earth is by definition a grounding electrode. And, yes, it must be bonded with the rest of the grounding electrode system.

The neutral is tied into the grounding system ONCE it's called the system bonding jumper. The system bonding jumper allows current to return to the neutral from the grounding system if there is a...

Will do when I find some time. In the meantime, sometimes a picture is worth a thousand words...https://images.platforum.cloud/uploads/20200805/6c88e8caf292a749f64c6179862649aa.jpg

That's what my dad taught me. "Work every wire like it's hot, just get in the habit. That way when it is, it won't bite you"

That's really kind of scary. If a unit happened to be isolated from the structure somehow, or on wood framing, it could potentially be 277 volts to ground and still be running.

You're right, there are a couple of limitations to that, but in general you are correct.

Quick summary of requirements:

Max length is 6'

Conduit up to 1/2 cannot have a circuit protected by...

That's not code compliant, but it is functionally valid, and would work.

We want a solidly bonded system to keep operating voltages to a safe level and to discharge surges on the grounding system, such as from lightning .

You are correct that current will eventually...

I happen to be a master electrician....

Please, do a little research and think this thing through. This kind of thinking is probably the most common cause of electrocutions. PM, or email me, I'd...

If you drive a ground rod and attach it to the unit, a ground fault will energize the rod at 120 volts. The voltage will slowly degrade in a gradient away from the rod.

The equipment grounding conductors ultimately end up at the primary disconnect where they are connected to the grounding electrode system and to the neutral via the system bonding jumper.

The...