Health ( Public Buildings ) Regulations 1992 https://www.legislation.wa.gov.au/legislation/prod/filestore.nsf/FileURL/mrdoc_35544.pdf/$FILE/Health%20(Public%20Buildings)%20Amendment%20Regulations%202002%20-%20%5B00-00-00%5D.pdf?OpenElement
Health (Public Buildings ) Amendment Regulations 2002 https://www.legislation.wa.gov.au/legislation/prod/filestore.nsf/FileURL/mrdoc_35544.pdf/$FILE/Health%20(Public%20Buildings)%20Amendment%20Regulations%202002%20-%20%5B00-00-00%5D.pdf?OpenElement
Guidelines on the Application of the Health ( Public Buildings ) Regulations 1992 https://ww2.health.wa.gov.au/~/media/Files/Corporate/general%20documents/Environmental%20health/Public%20Buildings%20Guidelines%20Final.pdf . This is the pdf version so is easier to print out or read on a tablet.
Some LED PAR’s have a Master/Slave function that is configured in the setup menu of the LED PAR. If there is no DMX present when the LED PAR powers up, it will run in the Master/Slave mode selected. A LED PAR running in Master mode will feed DMX out to the Slave fixtures, which will affect any other fixtures on the same DMX line.
If you turn the Desk or DMX source on before you power up the fixtures, they will not run in the default Master/Slave mode because of the DMX input present.
You should be starting with everything off so you do not overload any equipment.
To Turn on your stage lighting:
Make sure the master faders are fully down at zero.
Switch on the lighting desk.
Switch on the dimmer racks.
You can now bring up channels or scenes.
If you switch on the dimmer racks first, there is the chance that a power surge can occur in some dimmer racks.
If you switch on the desk without checking that the faders are at zero, there is the chance that a power surge can occur in some dimmer racks.
To turn OFF your stage lighting:
Turn the master faders down to zero so there is no current flowing through the dimmer channels.
Switch off the dimmer racks.
Switch off the lighting desk.
If you switch off the desk first, there is the chance that a power surge can occur in some dimmer racks.
Dance Production: Design and Technology by Jeromy Hopgood which can be accessed as an ebook from the State Reference Library.
The maximum loading of a dimmer rack is determined by the fuse or circuit breaker, which is usually 10 amps for most schools and community theatres, if you have a 12 channel dimmer rack. If you have a 6 channel dimmer rack, the channel capacity may be 20 amps or 4800W
the 10 amp capacity can also be referred to as a 2400 watt capacity.
You need to add up the individual wattage of your theatre lamps so they do not exceed the 2400W capacity of the dimmer rack channel..
As theatre lights are usually 500W or 650W or 1000W or 1200W, the answer can be:
four 500W or
three 650W or
two 1000W or
two 1200W or
combinations that do not add up to over 2400W total loading.
If you connect more that 2400W you may blow a fuse or trip a circuit breaker.
Hint – some standard dimmers have 16 amp circuit breakers !.
- Jands espII 24/48 desk
- Jands Stage 12
- Jands Stage 24
- etc Smartfade
- etc Smartfade ML
- LSC Maxim
- Theatrelight Scenemaster
We are told that LED theatre lighting is the way to go because it is cheaper to run because of lower power consumption, typically 20% of a conventional theatre light and they can produce lots of colours, BUT what do we need to consider when choosing a LED theatre Light.
Beam width is usually given, but not Field width because a LED fixture such as a LED PAR which is the most common sold, has multiple lens and each lens has side scatter, so you need a snoot of barndoor so the light only shows where you want it to shine.
The different coloured LED emitters on budget LED fixtures have narrow bandwidth with gaps between the colours which cannot correctly light most costumes and sets.
Budget LED fixtures had noticeable steps in the dimming at lower intensities which can distract or even annoy the audience.
Budget LED fixtures may not be repairable as parts for them are not easily obtainable.
LED fixtures can use a lot of dimmer channels on conventional lighting desks, so moving to LED lighting will need a new digital desk or computerised lighting controller. These are not as easy for inexperienced users to use instead of the conventional fader desk
ONLY if each of the dimmer racks has their own isolating switch as required in Health (Public Buildings ) Regulations 1992 section 44. Switchboards (3) Lighting dimmers shall be connected in the active conductors and an isolating switch shall be provided for each dimmer bank installed and where a resistive type dimmer is used the isolating switch shall be on the line side of the dimmer.
The three phase splitter must use two switched three phase outlets connected in parallel, you cannot use two three phase sockets without switches.
If you draw too much power you will trip the circuit breaker for the three phase outlet on the wall. Most switchboards are locked to ensure that the circuit breaker is not reset until the cause of the excess current is found and removed. The resetting of circuit breakers may only occur during normal working hours, so if you trip a circuit breaker during a show, you may not be able to use that lighting for the rest of the show(s).
You need to ensure that the maximum load or wattage on each phase does not exceed the 3 phase outlet circuit breaker rating. You need to make a list of which light(s) are on each dimmer channel for both dimmers and add up the total. 2400 Watts is 10 Amps.
When doing a Square One lighting design, you ideally want one light per dimmer channel for maximum flexibility of the design. If you are using 500W lights, then you will have 12 x 500W = 6000W or 6kW per dimmer rack. As there is 2 dimmer racks you will have 12kW maximum load which is 50 Amps total for all three phases or 16.6 Amps per phase. Three phase outlets for dimmers are usually 32 Amps or 40 Amps, so with one 500W light per dimmer channel, you only draw half of the power available.
For 24 x 650 Watt lamps the total is 15,600 Watts which is 65 Amps total for 3 phases, or 31.5 Amps total per phase which does not exceed the current rating of the circuit breaker.
If you want to use some 1kW lights, you will have to reduce the number of channels you use and balance the load across the three phases.