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Circuits of lighting system.
The two-wire circuits of lighting system and ordinary power outlets must
be arranged normally to work to a voltage of 120 volts and with capacity to 15
amperes of load. They cannot have more than 10 derivations (exits). To these
circuits them watts cannot be connected 1,500 greater loads of. These loads will
be computed in agreement with the criteria accepted by the Organization. The
exits do not need individual protection and can have bipolar switches. - the
minimum caliber of the conductors must be 14 AWG of copper for the circuits of
15 amperes. The calibers of the conductors, as well as the protection systems,
must be in agreement with the Norms of the National Electrical Code. - the
neutral one of the circuits must be of equal caliber that the one of the
respective alive lines. In two-wire boards, each circuit will have nculro own.
Circuit of Heating. The circuits destined exclusively for heating to 120 volts
cannot have more than 2,000 watts at the most; if the load is greater of 2,000
watts the circuit must be to trefoil or three-phase to 120/240 or 120/208 volts.
Connection of the Circuit. The Contractor must balance carefully all the loads,
when she connects the circuits to boards, trying that the imbalance of phases is
not superior to 10 %. Circuit of Power.
Conductors in agreement with the specified thing in the
planes will be used. When the conductors go by trays go suitably held them, by
means of synthetic thread or prefabricated plastic belts. He will have himself
special well-taken care of in placing first, in the tray, the conductors of
greater caliber. When the conductors go by pipe conduit has themselves special
well-taken care of in hauled his so that he is not going away to deteriorate in
his outer cover. By no reason the joint of conductors within the pipe will be
allowed. Canalizations. In anyone of the types of canalization described here,
for internal distributions, a voltage between lines or lines and earth superior
to 500 volts cannot be used. The different circuits of voltages and systems must
settle in independent conduits. - The canalizations constructed with opened
wire, must mount on insulators or presses of stoneware; the maximum distance
between insulators will be of 1,50 ms the minimum spaces between conductors and
between these and the parts of the building will be 3 and 1 cm., respectively. -
The wires exposed to mechanical failure will be protected with tube or metallic
molding at least up to two (2) meters of height on the floor, when it is
vertical wires, in case of being horizontal will be protected in all their
length. When a conductor crosses a wall, floor or division, he will be protected
with pipe. In case of crossings with pipe or wires of another circuit, material
insulators will be used nonconductor. If the conductors or leave from them will
be exposed outdoors is obligation to use material special to resist it. When
changing facilities of this class to pipe or armored cable, the use of a
terminal cap with the necessary entrances is obligatory through which they will
pass the wires without joint, it ties or together. |
