NFPA 780, Standard for the Installation of Lightning Protection Systems provides information on the installation of _____ for lightning protection systems .
Edison-base fuseholders shall be used only if they are made…
Edison-base fuseholders shall be used only if they are made to accept _____ fuses by the use of adapters.
Tap conductors not over 25 ft in length shall be permitted,…
Tap conductors not over 25 ft in length shall be permitted, providing the _____.
Interior metal water piping that is electrically continuous…
Interior metal water piping that is electrically continuous with a metal underground water pipe electrode and is located more than _____ ft from the point of entrance to the building shall not be used as a conductor to interconnect electrodes of the grounding electrode system.
At Type AC cable terminations, a(n) _____ shall be provided.
At Type AC cable terminations, a(n) _____ shall be provided.
Overhead service conductors are the conductors between the _…
Overhead service conductors are the conductors between the _____ and the first point of connection to the service-entrance conductors at the building or other structure.
Raceways and cables installed into the _____ of open bottom…
Raceways and cables installed into the _____ of open bottom equipment shall not be required to be mechanically secured to the equipment.
Electrically conductive materials that are likely to _____ i…
Electrically conductive materials that are likely to _____ in ungrounded systems shall be connected together and to the supply system grounded equipment in a manner that creates a low-impedance path for ground-fault current that is capable of carrying the maximum fault current likely to be imposed on it.
Metal wireways shall be permitted for _____.
Metal wireways shall be permitted for _____.
On a 4-wire, delta-connected system where the midpoint of on…
On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage-to-ground shall be durably and permanently marked by an outer finish that is _____ in color.