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Type: Posts; User: gar

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1. ## Thread: Grounded receptacles

by gar
Replies
5\$\$
Views
211

### 190626-9842 EDT If there was a solid short...

190626-9842 EDT

If there was a solid short circuit in the motor from hot to the motor frame, then for most branch circuit wiring the voltage motor frame voltage would be about 1/2 the supply...
2. ## Thread: Pole top transformer impedance

by gar
Replies
20\$\$
Views
451

### 190626-0819 EDT electrofelon: So the...

190626-0819 EDT

electrofelon:

So the previously shown tables are for secondary current not primary.

Take my rough calculation for a Z as seen at the primary as being 3*Zpri for the 1/2 used...
3. ## Thread: Pole top transformer impedance

by gar
Replies
20\$\$
Views
451

### 190626-0241 EDT ron: I have no idea what...

190626-0241 EDT

ron:

I have no idea what the transformer label is telling me. You are an engineer. Have you analyzed a transformer circuit and tried to determine what that label means, and/or...
4. ## Thread: Pole top transformer impedance

by gar
Replies
20\$\$
Views
451

### 190625-2333 EDT electrofelon and ron: I...

190625-2333 EDT

electrofelon and ron:

I suggest you study electrical theory some, and do some experiments.

What is the source of this statement? Exactly what circuit is being referenced?
...
5. ## Thread: DC GENERATOR

by gar
Replies
17\$\$
Views
936

### 190622-2257 EDT I did a search on automotive...

190622-2257 EDT

I did a search on automotive alternators and did not find any reference to any with no slip rings. It is possible to make one, but I doubt that it would be cost effective.

.
6. ## Thread: Is this second TVSS necessary?

by gar
Replies
10\$\$
Views
463

### 190622-2230 EDT Installer: Suppose your...

190622-2230 EDT

Installer:

Suppose your resistance to earth is 10 ohms, many locations it is higher. Suppose a direct lighting strike produces a current of 1000 A, could be much higher. Then...
7. ## Thread: Is this second TVSS necessary?

by gar
Replies
10\$\$
Views
463

### 190622-1502 EDTInstaller:HAAS CNC machines use a...

190622-1502 EDTInstaller:HAAS CNC machines use a 100 ohm 1/4 W carbon composition resistor in series with each RS-232 input. On the HAAS side of the resistor, basically the input to the RS-232...
8. ## Thread: Input Wattage for mix and match ballast & lamps

by gar
Replies
4\$\$
Views
268

### 190622-1426 EDT thewiseguy31: We need to...

190622-1426 EDT

thewiseguy31:

We need to know what you are talking about.

Gaseous discharge devices are what can be described as constant voltage devices. A constant voltage device is...
9. ## Thread: Is this second TVSS necessary?

by gar
Replies
10\$\$
Views
463

### 190622-0841 EDT Installer: Probably typical...

190622-0841 EDT

Installer:

Probably typical in its characteristics, which is not very good for real protection of electronic equipment.

No curves were shown and I don't know what is in the...
10. ## Thread: Is this second TVSS necessary?

by gar
Replies
10\$\$
Views
463

### 190621-2129 EDT Installer: Yes put a TVSS...

190621-2129 EDT

Installer:

Yes put a TVSS at the input of the outside panel. Then put another TVSS at the input of the electronic equipment.

You need to study the V-I characteristic of...
11. ## Thread: Input Wattage for mix and match ballast & lamps

by gar
Replies
4\$\$
Views
268

### 190621-1658 EDT What is a mix and match...

190621-1658 EDT

What is a mix and match ballast?

.
12. ## Thread: Trouble with a 5KV circuit.

by gar
Replies
11\$\$
Views
539

### 190621-1652 EDT SteveO NE: Start testing...

190621-1652 EDT

SteveO NE:

Start testing with a greatly reduced input voltage, and look for abnormal current and voltage. Start at a voltage where no tripping occurs.

.
13. ## Thread: How to factor high-wattage appliances into load calcs & branch circuit design?

by gar
Replies
10\$\$
Views
448

### 190620-1654 EDT Jon456: The NEC can't solve...

190620-1654 EDT

Jon456:

The NEC can't solve your problem.

Do analysis and discuss the problem with the customer.

I my kitchen I have 8 20 A circuits. Yet I have a problem. The one...
14. ## Thread: Where do we use 1.73 when calculating 3 phase power

by gar
Replies
23\$\$
Views
1,179

### 190620-0925 EDT The invention of the concept...

190620-0925 EDT

The invention of the concept of phasors to do AC calculations on steady state AC sine waves was by Steinmetz of General Electric late 1800s. See...
15. ## Thread: Where do we use 1.73 when calculating 3 phase power

by gar
Replies
23\$\$
Views
1,179

### 190619-2143 EDT Thesparky: The constant...

190619-2143 EDT

Thesparky:

The constant 1.732 is based on phasor analysis (vectors), and some assumptions.

Assumptions:
3 phase supply.
All waveforms are pure sine waves, no harmonics....
16. ## Thread: Delta/Wye Transformer Question....

by gar
Replies
4\$\$
Views
252

### 190619-2116 EDT garrisonm1: Your 1 minute...

190619-2116 EDT

garrisonm1:

Your 1 minute time constant implies a high resistance joint in a supply wire, and that after this time period the loose joint warms up enough to become a low...
17. ## Thread: LED color quality

by gar
Replies
0\$\$
Views
228

### LED color quality

190619-0738 EDT

A very interesting discussion on the subject of LED color output ---
...
18. ## Thread: An interesting story

by gar
Replies
17\$\$
Views
786

### 190618-1740 EDT synchro: Thanks for the...

190618-1740 EDT

synchro:

Thanks for the reference. A very good read.

.
19. ## Thread: An interesting story

by gar
Replies
17\$\$
Views
786

### 190618-0825 EDT When I made the first post my...

190618-0825 EDT

When I made the first post my goal had been to find out what voltage was used in telegraph circuits. The link in that first post did not provide the answer, but the link was...
20. ## Thread: An interesting story

by gar
Replies
17\$\$
Views
786

### An interesting story

190617-2501 EDT

See https://en.wikipedia.org/wiki/Electrical_telegraph

Many interesting things have been invented since George Washington's time.

.
21. ## Thread: DC GENERATOR

by gar
Replies
17\$\$
Views
936

### 190617-1254 EDT On the invention of the...

190617-1254 EDT

On the invention of the automotive voltage regulator see ---
https://ethw.org/First-Hand:The_Story_of_the_Automobile_Voltage_Regulator

My classmate's father invented a means of...
22. ## Thread: POCO issue or not?

by gar
Replies
22\$\$
Views
1,096

### 190616-2132 EDT With most areas now having...

190616-2132 EDT

With most areas now having smart meters installed, and assuming that the power company can get voltage information from the meters, then it should be possible to get some remote...
23. ## Thread: POCO issue or not?

by gar
Replies
22\$\$
Views
1,096

### 190615-2216 EDT Consider the general concept...

190615-2216 EDT

Consider the general concept of a voltage regulator.

This a device that in some way can adjust its output voltage based upon the measured output voltage at some output point....
24. ## Thread: Student, have a few questions about breakers/ power in general

by gar
Replies
12\$\$
Views
839

### 190615-2007 EDT sengineer101: Consider the...

190615-2007 EDT

sengineer101:

Consider the following question, and if you desire to analyze it, then provide all details on your analysis.

A Simpson 260 or 270 meter is a Weston D'Arsonval...
25. ## Thread: POCO issue or not?

by gar
Replies
22\$\$
Views
1,096

### 190514-1425 EDT FionaZuppa: On the surface...

190514-1425 EDT

FionaZuppa:

On the surface the power company plot does not show a problem, but their averaging time per point may be too long.

You will need to run your own tests.

My...
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