Converting NEMA L5-30P to NEMA 5-15R

[Anonymous user]

I own a SUM3000RMXL2U which comes with a 30a L5-30P input. I would like to use this on a home system and don't have a 30a receptacle to plug into. The proper solution is of course to have a 30a dedicated circuit installed but i'm trying to decide if that is overkill in my situation.

This unit is way overpowered for my needs. In fact at the moment I will only be using at MAX 800 watts (2 servers, each with a 400 watt power supply so the actual wattage is probably considerably less than 800).

Is it possible to use one of these adapters:

5-15 Adapters | 5-15P Pigtail Power Cable Plug Adapter

And not risk an electrical fire? If not, is there a backplate sold for my particular model that will convert the input to 5-15 and reduce the wattage the unit can cover? Any other options, or is installing a dedicated 30a circuit my only choice if I want to use this unit in my home, regardless of the fact that I will be using only about a third of the wattage?

[Anonymous user · Accepted solution]

According to an email I received from APC technical support I was forwarded to this link:

http://www.apc.com/site/support/index.cfm/faq/

Apparently it is safe to replace the input plug on the unit, but the unit will not be able to draw as much power (which is good). It should be safe on a 15a circuit provided I keep a high load off the unit to prevent the circuit from popping.

[BillP]

yes, you're correct.

[closefan]

Wouldn't the cable melt?

[closefan]

Sorry to revive such an old post but I was wondering if you can follow up on this as I have bought a PR3000RTXL2U from CyberPower which also has a thick NEMA L5-30P cable.  I want to change the actual cable.  If you did what you say, and change the entire cable to a thinner cable, wouldn't the internal part of the unit ask for more amps, and melt the cable?  (Note: I am a complete armature in all things electricity related. Thank you for any help)

[Teken]

If you intend to go this route simply purchase / make your own adapter. No need to replace the entire cord and plug. As it relates to current draw in a typical North American home it will be 14-2 Romex wire in the wall connected to a 15 amp breaker at the service panel.

If you draw more than 15 amps (sustained) over a period of time the breaker will trip. A device will only draw (consume) the ampacity it requires to operate - no more.

Regardless, a circuit is / should be derated to (80%) sustained load or 12-13 amps.