Disconnection device

[colinsmudger]

Do I need a disconnection device (fcu or switch) between the supply from the mcb to a Heat Recovery ventilation system?
At present there is only a multi position signal controller switch (off, timed, auto, manual etc).

 

[timhoward]

That depends on rating of MCB, cable used at each point, and power consumption of ventilation system.
So not really possible to say without more info (or photos if unsure).

 

[Zerax]

If it's in the loft... I'd be fitting local isolation anyway.

 

[Rockingit]

There should be a local isolator adjacent to the plant for emergency and servicing purposes. Typically on the ones I've worked on they've been fitted with rotary isolators on the housing somewhere.