What is the maxmum branch circuit protection allowed for both the primary and secondary

sides 0f a 2000 VA 480/120V single-phase power transformer? Q Hint: Refer to Table 35-2.)

1. 10 amp / 20 amp

2. 10 amp / 25 amp

3. 15 amp / 20 amp

4. 15 amp / 25 amp
 

 

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Table 35.2 Sizing of primary and secondary branch circuit protection of a power transformer Primary winding Branch circuit protection, percent of rated amperes 250 250 300 Secondary winding Branch circuit protection, percent of rated amperes 125ª 167 Rated amperes 9 or more 2-8.99 less than 2 a Where the calculated size of the branch circuit protection does not correspond to a standard size fuse or nonadjustable inverse- time circuit breaker, the next larger size is able to be used. See 31.3.8 for standard sizes of branch circuit protection. Rated amperes 9 or more less than 9 Table 35.2 Sizing of primary and secondary branch circuit protection of a power transformer Primary winding Branch circuit protection, percent of rated amperes 250 250 300 Secondary winding Branch circuit protection, percent of rated amperes 125ª 167 Rated amperes 9 or more 2-8.99 less than 2 a Where the calculated size of the branch circuit protection does not correspond to a standard size fuse or nonadjustable inverse- time circuit breaker, the next larger size is able to be used. See 31.3.8 for standard sizes of branch circuit protection. Rated amperes 9 or more less than 9

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