Notes for Tables 12(A) and 12(B)

Note 1: Vmax, Imax, and VAmax are determined as follows: Vmax: Maximum output voltage regardless of load with rated input applied.

Imax: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. When a transformer limits the output current, Imax limits apply after one minute of operation. Where a current-limiting impedance, listed for the purpose, is used in combination with a nonpower-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, Imax limits apply after five seconds.

Table 11(A). Class 2 and Class 3 Alternating-Current Power Source Limitations

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[*] Voltage ranges shown are for sinusoidal ac in indoor locations or where wet contact is not likely to occur. For nonsinusoidal or wet contact conditions, see Note 2.

Table 11(B). Class 2 and Class 3 Direct Current Power Source Limitations

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[*] Voltage ranges shown are for continuous dc in indoor locations or where wet contact is not likely to occur. For interrupted or wet contact conditions, see Note 4.

Table 12(A). Table PLFA Alternating-Current Power Source Limitations

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Table 12(B). PLFA Direct-Current Power Source Limitations

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VAmax: Maximum volt-ampere output after one minute of operation regardless of load and overcurrent protection bypassed if used. Current limiting impedance shall not be bypassed when determining Imax and VAmax.

Note 2. If the power source is a transformer, (VA)max is 350 or less when Vmax is 15 or less.





Pocket Guide to the National Electrical Code 2005
Pocket Guide to the National Electrical Code(R), 2005 Edition (8th Edition)
ISBN: 0131480014
EAN: 2147483647
Year: 2004
Pages: 120
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