Poll for the lighting folks here.
A common installation around here is to have a 2 pole timer open one leg of two 240V or 208V lighting circuits. Leaving one leg hot to the ballast.
Or a photocell that only opens one leg of the circuit (typical twist lock street light or pole parking lot light)
In the case with the MH lights they are cord and plug connected to a receptacle that is timed, however only one leg of the receptacle is switched.
Another job I am thinking of is a big box store with a GE lighting control panel using a 1 pole latching relay that fits in a 1/2" K/O on some 208V Line to line lighting circuits.
I am looking at three code sections:
210.10 (2005 and 2008 NEC) however the supply branch circuit does not have a grounded conductor and the switching device is not the disconnecting means.
410.93 (2008 NEC) (410.48 2005 NEC) however the timers are switching a 240v receptacle that a ballast cord and plug connects to, then the ballast connects to the mongul base lamp holder that is not of the switched type. (and there still is no neutral ).
410.140(B) (2008 NEC) 410.54(B) (2005 NEC) Might apply to the cord and plug connected ballast.
Note; I am not talking about the disconnecting means.
Thanks in advance.
A common installation around here is to have a 2 pole timer open one leg of two 240V or 208V lighting circuits. Leaving one leg hot to the ballast.
Or a photocell that only opens one leg of the circuit (typical twist lock street light or pole parking lot light)
In the case with the MH lights they are cord and plug connected to a receptacle that is timed, however only one leg of the receptacle is switched.
Another job I am thinking of is a big box store with a GE lighting control panel using a 1 pole latching relay that fits in a 1/2" K/O on some 208V Line to line lighting circuits.
I am looking at three code sections:
210.10 (2005 and 2008 NEC) however the supply branch circuit does not have a grounded conductor and the switching device is not the disconnecting means.
410.93 (2008 NEC) (410.48 2005 NEC) however the timers are switching a 240v receptacle that a ballast cord and plug connects to, then the ballast connects to the mongul base lamp holder that is not of the switched type. (and there still is no neutral ).
410.140(B) (2008 NEC) 410.54(B) (2005 NEC) Might apply to the cord and plug connected ballast.
Note; I am not talking about the disconnecting means.
Thanks in advance.