It is getting closer to the holidays, and many individuals will be tasked with installing holiday lighting and other electrically operated devices outside their dwelling units. Many folks find it a challenge to find accessible outdoor receptacle outlets for this purpose.
Join Keith Lofland as he explains how to calculate the minimum number of lighting circuits for residential dwelling units (general purpose).
As we continue to learn more about the COVID-19 virus, Members of the National Electrical Manufacturers Association (NEMA) are receiving questions regarding the cleaning and disinfecting of electrical equipment.
Resilience to power outages begins with the healthcare facility and its leadership. Facilities that prepare and plan for the unexpected will be less likely to have catastrophic failures and will be able to request and receive temporary assets faster if needed.
Selecting materials for electrical installations in environments that are or could be corrosive can be challenging.
From time to time, a request is made, typically by an installing electrical contractor, to label some or all the components of a modular wiring system with the circuit ID before shipping to the job site.
With options of panelboards, switchboards, and switchgear, the electrical system designer has a robust palette of options to provide the required overcurrent protection for conductors throughout the facility.
NFPA 70E Article 120, Establishing an Electrically Safe Work Condition, provides the lockout and tagout requirements necessary to provide an electrically safe work environment for the employee.
Ground faults arise when current flows from an energized conductor to ground inadvertently. The return path of the fault current is through living beings or equipment touching the grounding system. Ground fault detection is critical to protecting people and animals from shock or death.
The calculation of general-purpose branch circuits is determined by using a general unit load of 3 volt-amperes per square foot for one- and two-family dwelling units, which is derived from NEC Table 220.12.