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Old 06-30-2018, 06:28 PM   #1
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Hey folks. New member...long time lurker. Just thought I'd share this interesting call I had the other day. Draw your own conclusions.
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Old 06-30-2018, 06:33 PM   #2
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If the occupant wasn't home or it happened at night, the results could've been much worse. Just want some ideas as to cause.
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Old 06-30-2018, 07:15 PM   #3
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Not much surprises me anymore !
Seen most of it all before,
Nothing ever seems to change except the cost.
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Old 06-30-2018, 07:32 PM   #4
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Amen to that! Now the interesting part: Dryer wasn't in use at the time.Occupant stated nothing unusual had occurred prior to arc flash and fire. Breaker did not trip, occupant used WATER to extinguish fire. When I got there the line still had 220 on it. My IR camera showed no abnormal heating of either the 10/3 nm, or the breaker. It was a square-d homeline panel
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Old 06-30-2018, 07:36 PM   #5
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Dryer lint?

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Old 06-30-2018, 07:48 PM   #6
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Trenton...that's exactly my thinking. The dryer wasn't properly vented to the exterior of the structure. Over time, moisture built up in the receptacle ,and that corrosion, combined with heating and carbonization of the dryer lint created an alternative path for the fault current. The lethality factor here is through the roof.
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Old 07-01-2018, 07:29 AM   #7
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Lint is an excellent fire starter. If theres enough, any small arc will light it up and anything flammable nearby will catch and burn.

Pics look like there was a wad of lint that caught fire and burned out.

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Old 07-01-2018, 11:16 AM   #8
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Is that a mouse tail in the top picture?


Welcome to the forum mikey.
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Old 07-01-2018, 12:07 PM   #9
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Thanks for the welcome John. No not a mouse tail. It's what's left of one of the hot conductors. I entered the incident cause into the NFIRS database as 1. User error (Not having the dryer properly vented) 2. Electrical fault-Supply conductor arcing 3. Receptacle overheating. Thanks for the input.
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Old 07-01-2018, 12:10 PM   #10
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Just in case you were wondering, NFIRS is the National Fire Incident Reporting System, which is used by the fire service to track incident cause/origin, among other things.
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Old 07-01-2018, 09:38 PM   #11
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Is that a baseboard heater above where the dryer outlet was?
If so, it's a wonder that a lint fire hadn't already occurred.
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Old 07-01-2018, 09:40 PM   #12
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Yup. Baseboard heater. Not electric though, hot water.
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Old 07-01-2018, 09:56 PM   #13
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When you say the dryer was not in use. Do you mean not being used or not plugged in?
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Old 07-01-2018, 10:02 PM   #14
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Not being used at the time.
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