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| Subject - Mobile home codes | |
| David Hyatt |
I tried to search about this topic I thought was discussed before but couldn't find it. How can a mobile home manufacture not install by the NEC? I have noticed recently that water heaters in older mobile homes are wired with 12/2 and on a 20amp breaker? First thing if there are 2 4500 watt elements it seems like it would trip the breaker anyway. I believe that only one element will heat at a time? Right? 4500/240=18.75 In that case it should be fine on a 20 amp breaker. But what about 125% per code 422.13. 18.75x125%=23.43 could be on a 25 amp breaker. We always use #10 and a 30amp breaker. I think the 30 amp breaker is allowed because of 422.11 E(3) 18.75X150%=28.13next higher size being 30amp. If all the above is correct then why are mobile homes different? |
| Wirenutz | 550.11(B) would seem to concere with 422.11.... |
| electroman | Manufactured homes are manufactured in accordance with the standards set by HUD. There is a label on a corner of each home stating this. Burn baby burn!!! |
| kbsparky | quote: Look again. I think you'll find that the older mobile homes have water heaters in them with 3500 watt elements in them. At least, they did when they were new <shrug> 
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| lctrc789 | David, If you go back one of my posts a few months ago was on a newer Modular,(double wide) home, they had not wired the bathroom recpts. on a 20 amp circuit rather a 15 amp circuit, they also had no arc fault detectors in the bedrooms... I gave them a non compliance and soon to find out the pen is mightier then the sword. They follow HUD and federal guidelines and do not fall under the same as the NEC as homes. Many of the older mobile homes did not have 4500 watt heating elements , My mother in law had an older Mobile home at the lake and the water heater had a 3500 watt element.. 14.5 amps thus a 20 amp breaker and 12 gauge wire.... |
| Alfred | Sounds to me that the HUD & the Governent are (as usual) always a step behind. Thanks Alfred Johnson 
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| Scott Vickrey | Here's the other mobile home topic. Double Wides |
| David Hyatt | Still if you dont use 125% and only one element works at one time then a 4500w will still be under 20 amps right? |
| kbsparky | The problem with that thinking is found in 422.13 which reads in part:quote: There is no escaping the continuous load requirements.
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| Wirenutz | quote: my laugh out loud moment for the day! well we could pick out plenty of discrepancies after chap 3 and the rest of the code could'nt we ? art 550, imo, is a fair example of lobbyists within th CMP check out (assuming you collect older code books) whom has sat for these committees over the cycles ... tradesman say our codes are written in blood, but they are also written in $$$$ ~W~ |
| Alfred | When I was working as an apprentice years .... ago, the company I was working for got an electricial inspection passed with two bottles of Jack Daniels plus two steak dinners. Tell me there isn't politics in electricial work!
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| lctrc789 | I think that the politics are in our lives like it or not, I have seen inspecions go by that should have never let go by so to speak. As far as the modular, double wides, and manufactured homes go ..., Yes they are behind in the times as far as many codes in homes are not. Duct work in many of these is very cheap aluminum type or very thin sheet metal type, electrical is not up to code by the standard NEC for homes... They do exceed in insualtion, and economics but the rest they are in the world of their own.. |
| stedder | As I stated in the a-fore mentioned post the modular and mobile home companys work by a different set of rules, being "factory built" and with HUD / Gvt. backing are allowed more latitude, it seems if we could use their standards there'd be a one-a-day fire. I can't believe the govt. lets them go (and you don't see them on fire on every block) but  ugggh man.
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| Ryan_J | quote: Watch for a tentative interim amendment on this section. I talked with a few people on the various code making panels about this. There is a discrepency with this section and table 220.3 that makes this "requirement" a moot point. Notice that the table points to 422.11(?), not 422.13. Right now only the branch circuit would have to be considered continuous. I'll check more on this topic when I have code book with me. |