From an Engineering/Safety perspective, that is incorrect. You always fuse to the load, or the limits of the cable, whichever is LESS.
Again, I am not saying this is totally incorrect... but since you are deferring to Engineering and Safety perspectives:
From an Engineering Perspective; You would follow the guidelines of the IEEE (Institute of Electrical and Electronic Engineers) - of which I am a member.
The IEEE guidelines read:
As the definitive safety standard for electrical engineering guidelines; the National Electrical Code sets the ground rules and guidelines for practical safeguarding of utility workers and the public during the installation, operation, and maintenance of electric supply, communication lines, and associated equipment.
From a Safety Perspective; You would follow the guidelines of the NFPA (National Fire Protection Association) - which dictates and writes NFPA70 - which is the basis for the National Electrical Code.
<p>90.2 Scope. <br />(A) Covered. This Code covers the installation and removal of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and optical fiber cables and raceways for the following:<br />(1) Public and private premises...
www.nfpa.org
First one doesn't understand "electrical code" and another can't read so he choses to wave around with emma rules🤣.
EMMA in Europe, or IASCA in North America draw their rulebook standards from the compliant Electrical Code in the residing country. They don't just make-up their own rules for car audio... it is a standard, based on the Electrical Code of that country.
Electrical Code is almost identical in all countries. There are slight variances, but for the most part it is a universally accepted code.
- In the USA; the National Electrical Code is written in conjunction with the NFPA (National Fire Protection Agency).
- In Canada; the Canadian Electrical Code is independent, but follows the same guideline principals as set-out by the NFPA.
- In Europe; the electrical standards are created and approved by one of the three European Standards Organizations: CEN, CENELEC, or ESTI.
In all situations, the electrical code rules follow the same principal, which states that; the protection device is there to protect the wire...
National Electrical Code, Rule 240.1, states:
Overcurrent protection for conductors and equipment is provided to open the circuit if the current reaches a value that will cause an excessive or dangerous temperature in conductors or conductor insulation. The fundamental purpose of overcurrent protection (fuse or circuit breaker) is to protect conductors against the effects of excessive temperature on conductors and conductor insulation from overcurrent.
National Electrical Code, Sub-Rule 2.40.1.5, states:
Flexible cord and flexible cable shall be protected by an overcurrent device in accordance with the maximum ampacity rating of the conductor gauge and temperature rating of the insulated jacketing.
