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Type: Posts; User: ggunn

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1. ## Thread: Second grounding electrode

by ggunn
Replies
12\$\$
Views
526

### Doesn't the second ground rod need to be bonded...

Doesn't the second ground rod need to be bonded to the first via a conductor in addition to the EGC connecting the two panels and external to the conduit containing the feeder?
2. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### Of course it is; I don't believe anyone has said...

Of course it is; I don't believe anyone has said otherwise. Measuring that Watt in the real world involves averaging some quantity of energy over a time interval, though.
3. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### I think you (the collective you) are twisting on...

I think you (the collective you) are twisting on the point where calculus applies. For example, any a line in X-Y space has a slope for every value of x, but it cannot be determined from that point...
4. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### And then there is the federal pen. :D

And then there is the federal pen. :D
5. ## Thread: Load-side interconnection where there are no spaces in panel

by ggunn
Replies
10\$\$
Views
327

### Agreed on all points. I have run into this exact...

Agreed on all points. I have run into this exact problem, and a supply side tap on the input busbars of the MDP main breaker was the only viable solution. That, or add another section to the MDP, but...
6. ## Thread: Load-side interconnection where there are no spaces in panel

by ggunn
Replies
10\$\$
Views
327

### That assumes facts not in evidence, your honor. ...

That assumes facts not in evidence, your honor. :D
7. ## Thread: Load-side interconnection where there are no spaces in panel

by ggunn
Replies
10\$\$
Views
327

### If it's 100kW at 480VAC three phase, it looks to...

If it's 100kW at 480VAC three phase, it looks to me like it could just barely fit into a 150A OCPD. (100,000)(1.25)/(480)(sqrt3) = 150.35A. About 73kW is the most that would fit into a 110A OCPD at...
8. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### This is a silly argument, IMO. In AC power the...

This is a silly argument, IMO. In AC power the fact that in theoretical terms a Watt is an instantaneous quantity is a useless distinction; 120 times a second the voltage crosses zero so the voltage...
9. ## Thread: Theoretical GFCI question, Fridge should never be on one?

by ggunn
Replies
36\$\$
Views
1,116

### I could be away on vacation when the GFCI trips;...

I could be away on vacation when the GFCI trips; sometimes a heavy rain will do it. No, thanks. I'll just leave the fridge plugged into a regular outlet if it's all the same to you.
10. ## Thread: Theoretical GFCI question, Fridge should never be on one?

by ggunn
Replies
36\$\$
Views
1,116

### My fridge is not on the single GFCI circuit in my...

My fridge is not on the single GFCI circuit in my home. I wouldn't want it to be; the GFCI is sometimes tripped for days and I don't know it.
11. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### So Watt, I mean so what? It's a distinction...

So Watt, I mean so what? It's a distinction without a difference. My point was that some POCO's charge not only a rate per kWh, but add a peak demand charge based on kW. It makes no difference if...
12. ## Thread: Metal Wireway- Steel Columns

by ggunn
Replies
5\$\$
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257

### :D

<stupid point deleted> :D
13. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### Yes, but current is a flow rate and therefore has...

Yes, but current is a flow rate and therefore has a time dependency.
14. ## Thread: PV System Supply-Side Connection

by ggunn
Replies
6\$\$
Views
267

### My question as well. If you are landing on...

My question as well. If you are landing on existing busbar perforations on the line side of the main breaker in the MDP, it isn't a field alteration according to all (three, I believe) the MDP...
15. ## Thread: PV System Supply-Side Connection

by ggunn
Replies
6\$\$
Views
267

### I have run into this several times, where we want...

I have run into this several times, where we want to land on empty existing holes in the bus bars on the supply side of the main breaker of the MDP. The AHJ's wanted to get some documentation from...
16. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### I am of course aware of that, but the language in...

I am of course aware of that, but the language in some tariffs refers to kW rather than kWh. Just how many angels can dance on the head of that pin, anyway? :D
17. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### Of course; see my edit.

Of course; see my edit.
18. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### Of course, but what some utilities are looking...

Of course, but what some utilities are looking for is that peak rate of current flow. I have read tariffs that explicitly say that. Of course there really is no such thing as an instantaneous...
19. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### It varies depending on the utility, but it is kW...

It varies depending on the utility, but it is kW rather than kWh, though.
20. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### Actually, in many places you get charged for...

Actually, in many places you get charged for both. In addition to the kWh charge for energy used there is a kW surcharge based on your peak demand.
21. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### As I said, what I think you are not taking into...

As I said, what I think you are not taking into account is what the service rendered by the vehicle is worth to you. You could express it in terms of hard currency, though the exchange rate is...
22. ## Thread: One prediction on electric cars

by ggunn
Replies
178\$\$
Views
4,414

### That's a very narrow view on ROI; if that were...

That's a very narrow view on ROI; if that were all there was to it, no one would ever buy a car. The service that a car performs is worth something to you, and that is the R in ROI. How much that is...
23. ## Thread: Is this safe or legal? (Safety experts will love this)

by ggunn
Replies
75\$\$
Views
2,607

### Through a fixed resistance, of course. Ohm's Law:...

Through a fixed resistance, of course. Ohm's Law: I=V/R
24. ## Thread: WIFI, RF & EMF

by ggunn
Replies
35\$\$
Views
1,086

### PSMJ Pseudo Scientific Mumbo Jumbo There was a...

PSMJ Pseudo Scientific Mumbo Jumbo

There was a New Age bookstore here that had a bunch of quartz crystals laid out on black velvet at their checkout counter. If you picked one up while you were...
25. ## Thread: Is this safe or legal? (Safety experts will love this)

by ggunn
Replies
75\$\$
Views
2,607

### Interesting how they just pasted the picture of...

Interesting how they just pasted the picture of their logo onto the picture of the box.
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