If the breaker pops at a higher current the wire will get hotter than it should and could cause a fire. I agree all components should be able to handle at least 20% more than required but this cannot apply to the point where breakers pop. The breaker contacts, etc. should be able to handle more, you want it to pop before it self destructs. Allen > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist- > bounces@mit.edu] On Behalf Of James Cameron > Sent: Monday, February 16, 2015 5:00 PM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Insulation testing >=20 > My ambiguity detector fired ... >=20 > On Mon, Feb 16, 2015 at 03:36:48PM -0600, Richard R. Pope > wrote: > > Robert, > > It is ok for a breaker to trip at less than what the NEC > > specifies but not at a higher current. >=20 > I'd really want a breaker to trip at a higher current than it is > specified for. >=20 > -- > James Cameron > http://quozl.linux.org.au/ > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list > archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .