kaichosan
Member
- Location
- San Francisco, CA
San Francisco, CA location.
An the old elevator with DC power had the AC controls updated. The work was later tagged by the Elevator Inspector for non-compliance. I understand the inspector requires one disconnect for both the 250 VDC power and the 120 VAC control.
Here is the tagged note:
"The conditions in need of correction are noted below, The numbers following the listed items refer to the sections of the California Code of Regulations (Title 8), or the Labor Code (L.C.) of the State of California.
1.) The elevator disconnecting means shall be provided a single means for disconnecting all
ungrounded main power supply conductors for each unit. 620-51"
Questions:
1. Is it not sufficient to have two disconnects next to each other (one for power, and another for AC control)?
2. If not, anybody know of one disconnect to handle both the 205 VDC power as well as 120 VAC controls?
3. Elevator maintenance suggested using existing DC power to run an inverter to get the 120 VAC for control. I'm not sure about inrush currents affecting inverters (1500W).
Thank you in advance, folks!
An the old elevator with DC power had the AC controls updated. The work was later tagged by the Elevator Inspector for non-compliance. I understand the inspector requires one disconnect for both the 250 VDC power and the 120 VAC control.
Here is the tagged note:
"The conditions in need of correction are noted below, The numbers following the listed items refer to the sections of the California Code of Regulations (Title 8), or the Labor Code (L.C.) of the State of California.
1.) The elevator disconnecting means shall be provided a single means for disconnecting all
ungrounded main power supply conductors for each unit. 620-51"
Questions:
1. Is it not sufficient to have two disconnects next to each other (one for power, and another for AC control)?
2. If not, anybody know of one disconnect to handle both the 205 VDC power as well as 120 VAC controls?
3. Elevator maintenance suggested using existing DC power to run an inverter to get the 120 VAC for control. I'm not sure about inrush currents affecting inverters (1500W).
Thank you in advance, folks!