>> mr. loy? >> who makes this? >> american fittings. >> oh, yeah. e.m.t. four-inch, wet location. shows a little u.l. stamp on it. >> i have to add for the small fittings, when you can't put those marks on, you have to go to the box. it says it on the box. >> there's nonmetallic cable for you. it's the white stuff. and the yellow stuff. >> what's the dinches between white and yellow? >> white is 14-gauge wire. in san francisco, it's not used in commercials. the national code it's restricted to type five, wooden construction. >> this gauge up to 15 amp is used for your typical plug loads. >> this wire is used for the laundry, the circuits and the other slightly larger -- >> is there a piece sticking out here? it's noticeably bigger? >> no. not noticeably bigger. >> it has actually multiple conductors in it. three conductors >> three conductors. it's got a white conductor that's called the neutral. a black conductor that's called the ungroud grounded wire, hot wire. and it's got a conductor that's called the ground wire. >> let's take a-- it must take a lot

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