• RCD 3 = Red power points
  • Essential Power
  • Backed up with generator power
• RCD 2 = Blue power points
  • UPS = Uninterruptible Power Supply
  • 1 UPS per OT
  • Battery backup for 30 minutes
  • And generator backup
• White power points
  • Grid only, no backup
• Specialty power supply
  • 1 x 32 A 3-phase outlet
  • More power
  • for lasers
  • 1 per OT

• 10 A = normal
• 15 A = taller vertical slot = for heaters / coolers / CPB

• safety device
• components
  • power source
  • active wire
  • neutral wire
  • detector coil = around both wires = no current flow
• switches off electricity automatically if there is fault
  • detects if the current flow through the active and neutral wires is equal
  • if fault results in current leaking to earth, then flow will be different
  • current will be induced in detector coil
  • circuit breakers are tripped and power supply is stopped
  • will detect current leak 5-10 mA
  • will "trip" within 10-20 ms = protect against macroshock
• does NOT protect against
  • current going through body and back via neutral (rare)
  • microshocks
• power points protected by an RCD are RED
• Types
  • Non-portable = fixed socket outlet on wall
  • Portable = incorporated into power cables or power boards

• components
  • primary circuit
  • secondary circuit
  • line isolation monitor = detects difference in current in both circuits
• LIM will alarm if prospective hazard current > 5 mA
• difference between RCD and LIM
  • RCD will interrupt power
  • LIM will alarm but will NOT interrupt supply
• This is so that power to critical life support equipment is not shut off
  • if the LIM alarms, you should unplug that last item of equipment that was plugged in
  • that is the most likely source of the fault
• LIM alarm
  • check gauge
  • threshold = 2 mA
  • 2-5 mA = likely too much electrical equipment plugged in
  • 5+ mA = likely faulty piece of equipment
• Power points protected by a LIM are BLUE

• Normal for earth wires at different power points to have a small potential difference
  • due to different sum of resistances in the wires and connections
• EES uses a large diameter copper cable to connect all earth points in a room together
• Reduces the potential sources of a microshock
• EES is requirement for a cardiac protected treatment area
• These are the green knobs = "EP Junction" with a test green knob

• Cardiac bypass machines
  • have a hand crank as back up
• Ventilators
  • Some have no battery backup
• Anaesthetic machines
  • 90 minutes of battery backup

• Unprotected
  • Type B = Unprotected
  • Symbol = Man
  • Some equipment cannot be constucted
• Body Protected
  • Type BF = Body Protected / Floating
  • Symbol = Man in a box
• Cardiac Protected
  • Type CF = Cardiac Protected, Floating
  • Current is limited to prevent microshock
    • max allowable leakage
      • Class I = 50 uA
      • Class II = 10 uA
  • Symbol = heart in box

• Body Protected Treatment Area
  • RCD / LIM
  • Protection from macroshock
• Cardiac Protected Treatment Area
  • Required where direct cardiac connection is likely
  • Offers protection from microshock
  • Requires RCD / LIM
  • Also requires equipotential earthing system
  • This means PICCs should not be inserted in ward, unless in cardiac protected treatment room

https://www.mak95.com/studynotes/Equipment%20Safety.html

https://litfl.com/prevention-of-electrocution/

https://www.adelaide.edu.au/hr/ua/media/6261/rcds-appendix-c.pdf

https://propofoldreams.files.wordpress.com/2015/03/physics-electrical-safety.pdf

https://aneskey.com/electrical-and-fire-safety-3/

https://www.apsf.org/article/line-isolation-still-important/