i got this ups and surge protector https://www.google.com.ph/imgres?imgurl=http://www.imaginet.com.ph/images/products/apc/Back-UPS-ES-500-2.jpg&imgrefurl=http://www.imaginet.com.ph/products/apc/apc-back-ups-for-home-and-office-power-protection/power-protection-and-battery-backups-for-home-and-office-computer-systems&h=169&w=280&tbnid=E0fS8mG7Mf2Q8M:&docid=DglDyh35pe301M&ei=rya8VtjmEMW20ASpq4LoCA&tbm=isch&ved=0ahUKEwiY-p-qh-_KAhVFG5QKHamVAI0QMwgcKAEwAQ&biw=1440&bih=799 and is it okay if i dont use the ground ? will this still worked ? pls i need an expert