I have a question regarding the tap rule for 240.21(B)(1)-(5).
If a UL instrument or meter is installed that is self protected and isolated such that it requires no fusing (per manufacturer's instructions) and is following the tap rule 240.21(B)(1) through (5), I have the following questions:
1. The device draws two amperes maximum. What size wire is required when tapping off a 480 Volt 1000 amp service?
2. Per this section of the national electric code no fusing or supplementary protection is required as long as the instrument wiring meets the section rules. Correct? In other words, the tap wiring will be less than 10 feet and goes directly to the instrument without fusing, and the instrument is mounted inside of the switchgear.
Thank-you for your help.
If a UL instrument or meter is installed that is self protected and isolated such that it requires no fusing (per manufacturer's instructions) and is following the tap rule 240.21(B)(1) through (5), I have the following questions:
1. The device draws two amperes maximum. What size wire is required when tapping off a 480 Volt 1000 amp service?
2. Per this section of the national electric code no fusing or supplementary protection is required as long as the instrument wiring meets the section rules. Correct? In other words, the tap wiring will be less than 10 feet and goes directly to the instrument without fusing, and the instrument is mounted inside of the switchgear.
Thank-you for your help.