MIL-DTL-16036M(SH)
(1) One sensor shall be 6 inches from the bottom of the switchboard section.
(2) One sensor shall be 6 inches from the top of the switchboard section.
(3) One sensor shall be at half the height of the switchboard section.
4.4.3.6.3.3.2 Compartment temperature sensors.
4.4.3.6.3.3.2.1 Compartments other than bus compartments. Each switchboard section compartment other than
a bus compartment shall have two temperature sensors at the following locations:
a. One sensor shall be 2 inches from the top at the compartment midway point from front-to-back and as close
to the center of the compartment as possible.
b. One sensor shall be 2 inches from the bottom at the compartment midway point from front-to-back and as
close to the center of the compartment as possible.
4.4.3.6.3.3.2.2 Bus compartments. There shall be three temperature sensors per switchboard unit in the bus
compartment (i.e., a three-unit section shall require nine separate sensors) at the following locations:
a. One sensor shall be 2 inches from the top at the compartment midway point from front-to-back and as close
to the midway point of the unit width as possible.
b. One sensor shall be 2 inches from the bottom at the compartment midway point from front-to-back and as
close to the midway point of the unit width as possible.
c. One sensor shall be at the half way point from the top to bottom of the compartment at the compartment
midway point from front-to-back and as close to the center of the unit width as possible.
d.
Sensors shall be mounted to each phase of the circuit breaker stationary element line and load terminals.
4.4.3.6.3.4 Temperature stabilization and temperature rise determination. All temperature readings for each test
shall be recorded during the same time frame and shall be of sufficient duration to allow stabilization of the
measured temperatures to a rate of rise within 3.6 °F (2 °C) per hour. Ambient temperature at each ambient sensor
location shall be maintained at 122±3.6 °F (50±2 °C). An average ambient temperature shall be determined by
averaging together the ambient sensor readings. The average ambient temperature shall be used to determine the
temperature rise of the switchboard compartments.
4.4.3.6.3.5 Circuit breaker loading and equipment energization. Circuit breakers shall be loaded to their
designed full load (element rating, continuous current setting, or rating plug value as applicable) at any convenient
voltage to simulate the heat dissipation characteristics the switchboard will have under actual operating conditions.
All transformers and equipment that utilizes internal transformers shall be energized. Turbine generator control
units shall be tested at 75 percent load. When a low voltage primary power source is used for testing, an alternate
control voltage source may be used for devices that tap off of primary power.
4.4.3.6.3.5.1 One-unit switchboard section. All ACB circuit breakers shall be fully loaded. If applicable, any
remaining load shall be divided among as many different AQB circuit breaker frame sizes as possible. If a section
only has AQB circuit breakers, the load shall be divided among as many different AQB frame sizes as possible. If
applicable, disconnects may be used for any remaining load after circuit breakers are loaded as discussed above.
Total loading of the unit shall not exceed the rating of the unit.
4.4.3.6.3.5.2 Multiple-unit switchboard section. Separate temperature rise tests equaling the number of units in
the section shall be conducted (i.e., a three-unit section shall require three separate tests). Each unit shall be loaded
in accordance with 4.4.3.6.3.5.1. If applicable, any remaining load shall be divided among the other units as
necessary. Total loading of a particular unit shall not exceed the rating of that unit. If the unit being fully loaded
receives power from a circuit breaker in another unit of the same switchboard section, that circuit breaker shall be
used to provide power to the fully loaded unit.
4.4.3.6.3.6 Voltage regulator loads. Dummy type resistive loads shall be used to simulate voltage regulator
components in the spaces allocated to these. These dummy loads shall be equal to the maximum heat dissipation
ratings of the regulator components.
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