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Flashcards based on the Philippine Electronics Code lecture notes for exam preparation.
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What is the primary purpose of the Philippine Electronics Code rules?
To establish uniform standards, regulations and requirements for Electronics and Communications Design in the Republic of Philippines.
To what does the applicability of the Philippine Electronics Code rules extend?
All electronics and/or communications design, planning, construction, installation, manufacture, production, fabrication, operation, and maintenance which comes within the jurisdiction of this code.
What is an exception to the reconstruction requirements when dealing with existing plants?
Adding service drops to an existing plant without changing the existing circuit.
What requirement must be met if an element is added to an existing plant?
That the added element meets all requirements, but it doesn't require changes in existing like elements unless the added element is related to existing.
How is the replacement of poles, towers, structures, or supports classified under the Philippine Electronics Code?
It's considered reconstruction and requires adherence to all strength and protection requirements of this Code.
According to the Philippine Electronics Code, what does compliance with its rules and regulations not relieve a utility firm from?
Compliance with statutory requirements.
What does the term 'accessible' mean in the context of the Philippine Electronics Code?
Admitting close approach because not guarded by locked doors or elevation.
What is acoustic shock?
The physical pain, dizziness, and sometimes nausea caused by hearing a sudden very loud sound.
What is an antenna?
A means for radiating or receiving radio waves.
What is an arrester?
Device which diverts high transient voltage to ground and away from the equipment thus protected.
What is an explosive atmosphere?
Air holding in suspension dust, metal particles or flammable gas in such proportions that may ignite explosively.
What are attachments in the context of the Philippine Electronics Code?
All of the plant elements which are fastened to a supporting structure such as a pole.
What does 'audio' mean?
Pertaining to frequencies which can be heard by the human ear.
What does 'automatic' describe?
Referring to the actions of a device taken without human supervision in response to pre-determined conditions.
What is a backbone?
The main system route, usually the route carrying the majority of the traffic.
What does Anhydrous mean?
Dry; containing no water.
What is the bandwidth of a device?
The difference between the upper and lower limits of the operating frequency of the device.
What is a battery?
A group of two or more cells connected together to furnish current by conversion of chemical, thermal, solar or nuclear energy into electrical energy.
What does a bond refer to?
A low resistance electrical connection between two cable sheets, between two ground connections or between similar parts of two circuits.
What is a cable?
Assembly of insulated conductors into a compact form which is covered by a flexible, waterproof, protective covering.
What is a conductor?
Anything such as a wire or cable which is suitable for the carrying of an electric current.
What are dropwires?
Insulated wires, used to run a subscriber‟s line from the terminal on the pole to the protector at the house of the building.
What is a fault?
A physical condition that causes a device, a component or an element to fail to perform in a required manner.
What is Flame roof?
Apparatus so treated such that it will not maintain a flame or will not be injured readily when subjected to flame.
What is a fuse?
A device used for protection against excessive currents.
What is a ground?
A conducting connection, whether intentional or accidental, by which an electric circuit or equipment is connected to the earth.
What does guarded mean?
Covered, shielded, fenced, enclosed, or otherwise protected to remove the likelihood of dangerous contact with a point of danger.
What is a hazard?
Any condition which imperils life, limb and property.
What is maintenance?
All of the work required to keep the plant, circuits, lines, facilities, systems and services up to standards.
What is a messenger?
Stranded steel wires in a group which generally is not a part of the conducting system, its primary function being to support wires or cables of the system.
What is practicable?
Capable of being accomplished by reasonably available and economic means.
What is a protector?
A device which provides protection from over-voltage and/or over-current.
What is reconstruction?
That work which in any way changes the identity of the plant or stations or portions thereof.
What is a dropwire?
Insulated wires, used to run a subscriber‟s line from the terminal on the pole to the protector at the house of the building.
What is a service drop?
The installation from the terminal on the pole to the protector at the customer premises.
What is Telecommunication?
Any transmission, emission or reception of signs, signals, writings, images, sounds or intelligence of any nature by wire, radio, visual, or other system
What is Tension?
Mechanical stress caused by forces which tends to stretch or severe the material stressed.
What does Underground mean?
Describing communication facilities installed below the surface of the earth.
What does Guarded mean?
Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, or casings, barriers, rails or screens, or platforms to remove the likelihood of dangerous contact.
What are the primary considerations of electrical protection in communications systems?
To minimize electrical hazards to persons, reduce damage to equipment, eliminate fire hazards, and reduce acoustic shock hazards.
What constitutes a proper balance in determining the amount of protection to be adopted and employed?
The cost of protection measures versus the value of potential damage and service interruptions.
What adverse effects can lightning surges produce in a communications system?
Dielectric failure and the fusing of conductors.
Besides good construction and adequate spacing, what is a second measure to address power contact/induction hazards?
To prevent excessive voltage rise in the communication plant and utilization of current limiting devices.
What should the amplitude of the sound pressure caused by the diaphragm of the telephone receiver not exceed to reduce acoustic shocks?
120 dB above 2 × 10-4 microbar at 1000 Hz.
What current parameters define a circuit as hazardous according to the Philippine Electronic Code?
ANY CIRCUIT FROM WHICH IN EXCESS OF 30 MA RMS AC OR 90 MA DC CAN BE DRAWN THROUGH A 1500 OHM RESISTOR.
According to the Philippine Electronics Code, how can current in a circuit be kept from rising above a predetermined value?
By the use of a fuse in series with the circuit.
What is the maximum ground resistance according to the Philippine Electronics Code?
NEVER EXCEED 5.0 OHMS FOR EQUIPMENT LOCATIONS, ANTENNA TOWERS, AND ALL ALLIED INSTALLATIONS, AND 25 OHMS FOR OUTSIDE PLANT TELEPHONE POLES AND MANHOLES AS WELL AS CUSTOMER PREMISES.
What area is likely to be diverted to a structure varies with the structure’s effective height?
A cone having a radius of three times the effective height measured from the top of the structure to the level of the point being considered.