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Positive Ground on 125 VDC Station Batteries
by The Watt Doctor. 05/23/19 08:55 AM
2020 is at the printers.
by gfretwell. 05/22/19 10:11 AM
Chinese wire symbols?
by Texas_Ranger. 05/19/19 03:09 PM
Pool - Daisy chained GFCI
by gfretwell. 05/18/19 01:30 PM
110.26 working clearances
by HotLine1. 05/14/19 02:08 PM
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Plug terminals
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General Discussion Area
05/23/19 12:55 PM
Thanks, gfretwell. We have Hall Effect devices on our large DC Motor Drives. However, that's not what I'm looking for in the particular case.
2 50 Read More
NEC & other Code issues
05/22/19 02:11 PM
This will effectively make the "6 switch" rule obsolete but I doubt many 1&2 family are using that rule these days anyway. I suppose there are existing split bus panels out there but they are overdue for an upgrade and when that happens they will bump into this rule. It will increase the sales of "Meter main" panels I suppose.
The only debate I have heard on the down side is you might have kids tripping the main as a prank. That could be devastating on an unoccupied house in the winter.
2 51 Read More
Non-US Electrical Systems & Trades
05/19/19 07:09 PM
Probably up to the user's/circuit designer's discretion, don't you think? I'd think it's just a simple, random way of identifying each core, without any conventional meaning attached to it.
1 62 Read More
General Discussion Area
05/18/19 05:30 PM
There is no problem daisy chaining GFCIs, I do it all the time with the cord mounted GFCI I use when I am working outside. The circuit has or is supposed to have a GFCI but I still like having one I monitor and test regularly. There is also a GFCI on my boat lift in addition to the GFCI feeding the circuit.
This is a very mature technology and I am skeptical of any claims of false trips unless the GFCI itself is bad. That is usually a hard failure. (won't reset, even with the downstream circuit disconnected).
You are right, it is beyond the code requirement but it should work fine.
2 72 Read More
NEC & other Code issues
05/14/19 06:08 PM

Yes, there is some abuse of 110.26 by both some inspectors, some 'plant safety guys' and some sparkies.

The disco up above the drop ceiling, I have no issue with, in sight of the equipment served, and IDd as to the source of the feeder/branch circuit. I just completed an HVAC replacement project at a utility training center with 68 AHs all above the drop ceilings, with no issues.

As to the LOTO, yes, I have come upon both extremes, overkill, and 'where is it'. Tape is not a LOTO, no matter what you write on it. One facility has LOTO on all new installs until inspections are completed, 6 locks are common.

H2Os case is just the AHJs decision. A talk may help.
5 131 Read More
NEC & other Code issues
05/03/19 09:42 PM
The cable we are talking about is 4/0-4/0-4/0-2/0 and as long as we only use two cables we'd be okay.
10 180 Read More
Non-US Electrical Systems & Trades
05/03/19 08:30 AM
It is already 133/230 TT, so I guess that is the way they will do it.
136 186,147 Read More
NEC & other Code issues
05/03/19 02:34 AM
The bottom line is, "what does the label say" . You don't need to wire any motor load for the locked rotor current because it is only there for a second or less. We wire for 125% of the full load amps. In a complex box like an HVAC system the industry engineers evaluate that box and give you a label for guidance. As an electrician or inspector we should just believe. You can use a #12 for that if everything is rated 75c (breaker, conductors and HVAC lug)
1 71 Read More
Non-US Electrical Systems & Trades
05/03/19 12:02 AM
Originally Posted by winston_1
Originally Posted by Texas_Ranger

North Korea apparently also uses Schuko sockets but the mains frequency seems to be 50 Hz.

When I visited North Korea around 3 years ago they were using Chinese sockets.

That's quite interesting! Seems that online sources are either outdated or plain wrong!
86 156,685 Read More
NEC & other Code issues
04/29/19 08:11 PM
6 188 Read More

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