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RE: Zerozone 100VA PSU Fuse Issue

I can't remember if it originated with NEMA or UL electrical safety standards for transformers of 1000Vac and less. My above post was going from memory....

But the percentage rating for overcurrent protection can be found in 2014 NEC Article 450, 450.3, Table 450.3B

Duster's power supply uses a 100Va transformer. Max FLA rating is
100VA / 120Vac = 0.83 amps

Table 450.3B Maximum Rating or Setting of Overcurrent Protection for Transformers 1000 Volts and Less (as a percentage of transformer-rated current)

Primary Protection

Primary only protection

Currents Less Than 2 amps - 300%

Not sure I would go 300% on a 100VA power supply transformer though.

Note:
Currents of 9 amps or more, 125%.
Current less than 9 amps 167%.
Currents less than 2 amps, 300%

Throw in secondary protection and the percentages are 250% across the board. (see note 3)

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