earth leakage

[nike123]

hello all from my experince i have found out that tripping from rcd is caused by inbalance of live and neutral feed, its true you should supply each unit with a seperate rcd . Are the units inverter type ? as i have been told that you should change the rcd to a
RCD TYPE D instead of a type B as it takes long to trip or maybe it allows for a great inbalance someone tell me if this is true or am i talking rubbish? as i have fitted a RCD D TYPE to my daikin multi inverter in my house, becuase before the compressor used to start up slowly and then ramped up and triped the type B breaker,
now ive fitted the TYPE D it doesnt happen
cheers declan

Here in your statements you are mixing residual current protection device:
http://en.wikipedia.org/wiki/Residual-current_device

Type [AC or A or B]

Standard IEC 60755 (General requirements for residual current operated protective devices) defines three types of RCD depending on the characteristics of the fault current.

Type AC: RCD for which tripping is ensured for residual sinusoidal alternating currents.
Type A: RCD for which tripping is ensured:

• for residual sinusoidal alternating currents,
• for residual pulsating direct currents,
• for residual pulsating direct currents superimposed by a smooth direct current of 0.006 A, with or without phase-angle control, independent of the polarity.

Type B: RCD for which tripping is ensured:

• as for type A,
• for residual sinusoidal currents up to 1000 Hz,
• for residual sinusoidal currents superposed by a pure direct current,
• for pulsating direct currents superposed by apure direct current,
• for residual currents which may result from rectifying circuits, i.e.:
  • three pulse star connection or six pulse bridge connection,
  • two pulse bridge connection line-to-line with or without phase-angle monitoring, independently of the polarity.

and miniature circuit breaker.
http://en.wikipedia.org/wiki/Circuit_braker

Type Instantaneous tripping current
B above 3 In up to and including 5 In
C above 5 In up to and including 10 In
D above 10 In up to and including 20 In
K above 8 In up to and including 12 In For the protection of loads that cause frequent short duration (approximately 400 ms to 2 s) current peaks in normal operation.
Z above 2 In up to and including 3 In for periods in the order of tens of seconds. For the protection of loads such as semiconductor devices or measuring circuits using current transformers.

Miniature circuit breaker should be of B type for inverters and for non inverters of C type
Residual current devices should be of B type for inverters and A type for noninverters