QOD for 11/16/08 Electrical

[Marcel R. Cyr]

Originally Posted by badair

teaser + or minus shoe size

Hey, don't forget to hit the lug with hammer to make sure it don't come loose.

[John A. Sopher]

You got me on this one... As I hit the vote button I'm thinking AL wire..... Ohhhhhh too late.

[rbrady]

It looks like the cable could have a rating of anywhere from 125 A to 170 amp (e.g. TW vs. THHW vs. THHN).

It needs a main breaker rated to the lower of the cable rating or the panel rating.

[gbeaumont]

Originally Posted by rbrady

It needs a main breaker rated to the lower of the cable rating or the panel rating.

Hi Ralph, you sure??

Regards

Gerry

[gbeaumont]

Wow, over 200 views and only 25 answers????

Strange

Gerry

[rbrady]

Originally Posted by gbeaumont

Hi Ralph, you sure??

Regards

Gerry

After your comment, I zoomed in and it looks like it may be a split bus with 5 throws to disconnect all power. In that case, I guess it does not need a main shut-off/breaker, except that there should be a shut-off at the exterior (if it is not an exterior mounted panel).

[mjohnson6]

The answer was 125 Amps.

200 amp meter
1/0 AL SECs<------------ big key. "This is the lowest capacity component"
Panel rated @ 150 amp

1/0 "Aluminum" service entrance cable is only rated for 125amps

[mjohnson6]

Originally Posted by gbeaumont

Wow, over 200 views and only 25 answers????

Strange

Gerry

I guess they didn't want to look bad?~

My excuse??... I'm either so darn good looking...
or.... I just don't know any better!

LOL

[John A. Sopher]

I'm glad to know I got it right. The second time.... lol I voted for 150A but then clued into it being AL. I keep a note book full of cheat sheets, went and looked it up and saw it should be 125A.

I don't need to remember everything, I just need to know where to look for the answers to everything!

[gbeaumont]

Hi to all,

OK here's the answer

The meter is 200 amp
The SECs (1/0 AL) are good for 125 amps
The panel has no single disconnect (split bus) but has fewer than 6 moves to shut the home down.
The panel is rated at 150 amp.

I'd be reporting this as a 125 amp supply, in fact I did, this is from one of my inspections.

Regards

Gerry

[rbrady]

The way I understand it, there are different types of cables, as I stated in one of the early posts. I think the main difference is the type of insulation. Cable insulated with teflon has a higher rating than PVC.
For 1/0 Aluminum, my code check book shows a rating of 100A for TW or UF, 120 for XHHW or USE and 135A for USE-2 or XHHW-2.

I had an electrician on site at an inspection one time and I know he was trying to figure out the rating based on the type of wire, not just size.

[Marcel R. Cyr]

Hey Gerry, got it right. Not bad for a hammer Eh!

Well, I did get some inside undercover assistance.

[gbeaumont]

Originally Posted by rbrady

The way I understand it, there are different types of cables, as I stated in one of the early posts. I think the main difference is the type of insulation. Cable insulated with teflon has a higher rating than PVC.
For 1/0 Aluminum, my code check book shows a rating of 100A for TW or UF, 120 for XHHW or USE and 135A for USE-2 or XHHW-2.

I had an electrician on site at an inspection one time and I know he was trying to figure out the rating based on the type of wire, not just size.

Hi Ralph,

I definately agree on the differences in cable types however my code book shows the following for service entrances.

2 AL = 100 amps
1 AL = 110 amps
1/0 AL = 125 amps

Regards

Gerry

[rsummers]

Looks to be upside down?

[Paul W. Abernathy]

lol......guess not enough people watched my sizing video before I removed it from the web....lol