New York State Master Electrician Practice Exam

The load demand factor permitted for four or more appliances fastened in place is 75%. This factor is based on the principle that when multiple appliances are installed, not all of them are typically used at their maximum capacity simultaneously. Therefore, the demand factor allows for a reduction in the total connected load to account for this non-coincidental usage, promoting efficient load calculations.

When it comes to appliances that are fastened in place, they are expected to be used frequently, which distinguishes them from portable appliances. According to the National Electrical Code (NEC) and other regulatory guidelines, for four or more such appliances, the load may be adjusted to reflect typical usage patterns, allowing the electrician to assess the system requirements more accurately and avoid unnecessary overload.

The other options present different percentages that are not applicable in this scenario. For fewer appliances, different demand factors might be appropriate, but for four or more fastened appliances, the standard reduction to 75% is the correct choice for determining load demand.