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Search: Posts Made By: engr3000
Showing results 1 to 25 of 126
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Forum: Electrical - AC & DC
10-21-19, 12:52 PM
Replies: 16
Views: 648
Posted By engr3000

Yes the generator must be bonded to the green...

Yes the generator must be bonded to the green equipment ground wire that's in the cable feeding the breaker panel. You can add a ground rod at the generator and that would be a "supplementary...
Forum: Electrical - AC & DC
10-15-19, 10:30 AM
Replies: 13
Views: 847
Posted By engr3000

He will need a generator interlock kit in order...

He will need a generator interlock kit in order to safely backfeed a breaker in a main panel. Or have a transfer switch.

Tying 120V phases A and B together on the generator side of a backfed...
Forum: Electrical - AC & DC
10-11-19, 09:00 AM
Replies: 13
Views: 847
Posted By engr3000

The problems with the GFCI tripping are not...

The problems with the GFCI tripping are not related to having a transfer switch and they will still be there when one is installed.
Forum: Electrical - AC & DC
10-10-19, 05:47 PM
Replies: 13
Views: 847
Posted By engr3000

Apparently your generator has the neutral bonded...

Apparently your generator has the neutral bonded to ground because you cannot connect the ground wire to the panel without tripping the GFCI. Because the equipment ground conductors are also bonded...
Forum: Electrical - AC & DC
09-19-19, 01:52 AM
Replies: 7
Views: 420
Posted By engr3000

201V / 116V = 1.73 = sqrt (3) which is just what...

201V / 116V = 1.73 = sqrt (3) which is just what you would get if the two hot lines are each phases from a "wye" type three phase system. The nominal hot-to-hot would be 208V and the hot-to-neutral...
Forum: Electrical - AC & DC
09-16-19, 10:34 AM
Replies: 26
Views: 1,702
Posted By engr3000

I'm glad to hear that your project is working...

I'm glad to hear that your project is working well now.
Thanks for letting us know how it turned out.
Forum: Electrical - AC & DC
09-09-19, 04:47 PM
Replies: 10
Views: 489
Posted By engr3000

From the top of the second page of the document I...

From the top of the second page of the document I linked to in my post above:

"In accordance with Section 210.21(B)(1), If a single receptacle is installed on a branch circuit, it shall have an...
Forum: Electrical - AC & DC
09-09-19, 05:25 AM
Replies: 10
Views: 489
Posted By engr3000

NEC 210.21(B)(3) says that receptacles on a 50A...

NEC 210.21(B)(3) says that receptacles on a 50A branch circuit must be rated at 50A. I suggest putting a 60A breaker panel in your garage fed by your 50A circuit, and install a 20A 2-pole breaker in...
Forum: Electrical - AC & DC
09-08-19, 11:40 AM
Replies: 9
Views: 485
Posted By engr3000

One option might be to connect the light...

One option might be to connect the light circuit/outlet with a constant hot wire, and then use a smart bulb like a Philips Hue with the wireless battery-powered switch/dimmer:
...
Forum: Electrical - AC & DC
09-08-19, 10:49 AM
Replies: 13
Views: 855
Posted By engr3000

If the box is set back by 9/16" or more the...

If the box is set back by 9/16" or more the following metal ring spacer works well:
...
Forum: Electrical - AC & DC
09-05-19, 08:59 AM
Replies: 26
Views: 1,702
Posted By engr3000

I suggest putting the following buffer IC between...

I suggest putting the following buffer IC between the bluetooth device output and the power MOSFET:

https://www.adafruit.com/product/1787

This IC only needs its input signal to be above 2V to...
Forum: Electrical - AC & DC
08-19-19, 10:54 PM
Replies: 3
Views: 477
Posted By engr3000

Be careful if you have multiwire branch circuits...

Be careful if you have multiwire branch circuits (where wires on both phases share a common neutral). With both busbars on the same phase, the currents will add in the neutral instead of subtracting...
Forum: Electrical - AC & DC
08-11-19, 11:55 AM
Replies: 14
Views: 1,114
Posted By engr3000

According to 705.12 (D)(2)(3)(b), the sum of 125%...

According to 705.12 (D)(2)(3)(b), the sum of 125% of the maximum inverter output current and the panel's main breaker rating cannot exceed 120% of the panel busbar rating.
125% of your 71.5A...
Forum: Electrical - AC & DC
07-29-19, 09:40 AM
Replies: 14
Views: 623
Posted By engr3000

Either 20A or 15A receptacles are OK on a 20A...

Either 20A or 15A receptacles are OK on a 20A circuit with 12 guage wiring. 20A receptacles are prohibited on a 15A circuit because an appliance that came with a 20A plug would likely overload it.
...
Forum: Electrical - AC & DC
06-18-19, 01:37 PM
Replies: 17
Views: 1,597
Posted By engr3000

Another way is to have a contactor (aka motor...

Another way is to have a contactor (aka motor starter) do the switching of the large pump motor current, and so the switch by the door only has to handle the small current of the internal coil that...
Forum: Electrical - AC & DC
06-17-19, 10:39 PM
Replies: 12
Views: 948
Posted By engr3000

Online I found this excerpt from the 2014 NEC...

Online I found this excerpt from the 2014 NEC Handbook:

210.8 (C) Boat Hoists. GFCI protection shall be provided for outlets
not exceeding 240 volts that supply boat hoists installed in dwelling...
Forum: Electrical - AC & DC
06-15-19, 10:12 AM
Replies: 8
Views: 1,086
Posted By engr3000

Another precaution in this situation is to get an...

Another precaution in this situation is to get an in-line GFCI short extension cord (available at Home Depot, etc.) so it would shut off the power if current leakage is detected. That's asuming you...
Forum: Electrical - AC & DC
06-14-19, 05:20 PM
Replies: 33
Views: 1,911
Posted By engr3000

I just saw this thread for the first time. You...

I just saw this thread for the first time. You mentioned that you're using a generator now to power the well pump. It's important that the pump have full voltage not only when it's turned on but also...
Forum: Electrical - AC & DC
06-05-19, 07:20 AM
Replies: 2
Views: 448
Posted By engr3000

I assume you're talking about an H-bridge of 4...

I assume you're talking about an H-bridge of 4 mosfets.
When you say delay do you mean the frequency or period of the signal? With a delay you just have to wait longer for the same signal to appear....
Forum: Electrical - AC & DC
06-03-19, 07:24 AM
Replies: 7
Views: 806
Posted By engr3000

I'm in agreement with all of Joe's comments. ...

I'm in agreement with all of Joe's comments.
The neutral conductor must be colored white or gray according to 200.6 of the NEC.
It could be that the yellow wire goes to the light and this separate...
Forum: Electrical - AC & DC
06-01-19, 03:32 PM
Replies: 3
Views: 514
Posted By engr3000

This often depends on local codes, so see if you...

This often depends on local codes, so see if you can access a copy of the specific code for your jurisdiction. This is one of the areas where additional requirements are sometimes made beyond the...
Forum: Electrical - AC & DC
05-31-19, 11:02 PM
Replies: 3
Views: 730
Posted By engr3000

It sounds like the solar powered inverters and...

It sounds like the solar powered inverters and battery powered inverter are designed to interface at their outputs, but otherwise have no connections between them for control purposes?
Forum: Electrical - AC & DC
05-31-19, 10:15 AM
Replies: 7
Views: 783
Posted By engr3000

It's likely that the neutral wire connection to...

It's likely that the neutral wire connection to those problem outlets routes through the electrical box above the light fixture, and they got disconnected when you did your fixture replacement. There...
Forum: Electrical - AC & DC
05-31-19, 09:29 AM
Replies: 12
Views: 4,437
Posted By engr3000

What joed said in the first reply should be done....

What joed said in the first reply should be done. Assuming it's the usual duplex receptacle in the bathroom, plug the nightlight into one receptacle and then plug the blow dryer in the other. If...
Forum: Electrical - AC & DC
05-30-19, 05:04 PM
Replies: 3
Views: 730
Posted By engr3000

There should only be one place where a neutral...

There should only be one place where a neutral conductor is bonded to the equipment grounding conductor. Otherwise some of the current that should be in the neutral will flow through the ground...
Showing results 1 to 25 of 126
 
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