where the nec stops

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sksad1

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does the nec pertain to whats inside an ac unit.this one has breakers in it that are used for heating.these breakers are jumped between them.this is standed for ac units.
 
Are you talking about a factory installed or supplied jumper or did the installer put his own jumper in.

The installer could possibly put in his own jumper, but the lugs on the breakers likely are not designed for two conductors so some splicing device would be required.

The NEC does not stop where the wiring method enters the equipment, it stops at the manufacturers instructions that are part of the listing of the equipment.
 
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sksad1 said:
does the nec pertain to whats inside an ac unit.this one has breakers in it that are used for heating.these breakers are jumped between them.this is standed for ac units.
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IMO the nEC provides guidance for the protection of utilazation eq. If the item is an appliance art 422, generally applies. If it is a AC (and the op is general) then art 440 is involved. Actually in art 424 there is section 22;

424.22 Overcurrent Protection.
(A) Branch-Circuit Devices. Electric space-heating equipment, other than such motor-operated equipment as required by Articles 430 and 440 to have additional overcurrent protection, shall be permitted to be protected against overcurrent where supplied by one of the branch circuits in Article 210.
(B) Resistance Elements. Resistance-type heating elements in electric space-heating equipment shall be protected at not more than 60 amperes. Equipment rated more than 48 amperes and employing such elements shall have the heating elements subdivided, and each subdivided load shall not exceed 48 amperes. Where a subdivided load is less than 48 amperes, the rating of the supplementary overcurrent protective device shall comply with 424.3(B). A boiler employing resistance-type immersion heating elements contained in an ASME-rated and stamped vessel shall be permitted to comply with 424.72(A).

This type of language is common in art 422. actally there is language in 422 requiring a hand held hair dryer be equiped with a gfci, art 440 reguires a LCDI on cord connected AC units.

I see many rules in the NEC that apply to the individual unit.

As Bob mentioned if it is NRTL accepted the appliance or unit is generally goofd to go.

But the OP would need to supply more info.
 
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