According to ABYC A-24, how should a CO monitor be installed?

The installation of a CO (carbon monoxide) monitor according to ABYC A-24 is critical for safety on vessels. The correct approach is to have the CO monitor supplied by a circuit that utilizes a fuse or a lock-out equipped circuit breaker. This requirement ensures that the CO monitor remains powered under normal operating conditions and can continue functioning to alert occupants of hazardous CO levels.

Using a fuse or a lock-out equipped circuit breaker minimizes the risk of unintentional shutdowns or disabling of the CO monitor that could occur if it were connected to a circuit that is easily interrupted, such as one controlled by a simple switch or the main electrical panel breaker. This type of circuit setup adds an additional layer of reliability, ensuring that the device is always operational when needed, which is crucial since CO can pose deadly risks in enclosed or poorly ventilated spaces.

In contrast, having the monitor on a circuit that can be easily turned off, such as one controlled by the main electrical panel or equipped with an on/off switch, poses safety risks. This setup could lead to situations where the CO monitor is inadvertently switched off, leaving occupants unaware of dangerous carbon monoxide levels. Therefore, the method of circuit supply required by ABYC A-24 reflects best practices for maintaining