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1) The National Electrical Code has nothing to do with connecting space heaters into a commonly shared house panel. The only NEC requirements that need to be adhered to is the proper sizing of the dedicated circuit, no receptacles located above the heater, control functionality of the heater such as a thermostat or timer.
2) You will need to obtain permission from the condo association since the common electrical panel is also shared by the other units within the condo. The condo association may or may not allow this. Recommend to bring this up at your next condo association board meeting and explain that this would be beneficial to all existing owners. With the addition of a space heater in a common area, this really boils down as to how the initial installation expense and the additional monthly recurring electrical expense will be shared by all of the units since the dedicated circuit will be originating from a common electrical panel and not an individual unit's electrical panel. Requests such as this that are common to all unit's are generally taken by a vote of the condo association members.
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